Classes and the Divine

The gods welcome followers from any of the twelve classes presented in the PBH. Certain classes have stronger ties to the divine than do others. Clerics and paladins, for example, have direct ties to the gods, while druids along with some monks and rangers might see themselves as champions of the divine. Characters from other classes might have strong religious inclinations and use their talents and skills to advance the cause of their gods in the world. You can also find a list of the homebrew subclasses from "Book of the Righteous" here as well.

Barbarians

Barbarians can come from any land, but most live in the remotest parts of the world, where they must contend with dangers and hardships without the comforts and trappings of civilization. As most barbarians live in nature, they favor the Old Gods who embody the primal and elemental forces. Of them, barbarians are drawn closest to Urian the Sky, Rontra the Earth, and Shalimyr the Waters, though many also honor Eliwyn, the Tree of Life.
Subclass: Path of the Harrier

Bards

Most bards find welcome wherever they go. Entertainers without peer, their music and stories can move the hardest of hearts and inspire courage and hope in the most downtrodden. They keep the lore and histories of the land, carry news from far-flung places, and might even bear messages and warnings. Bards also play a part in the spread of religion, for most are versed in the old myths and recount them for audiences, reminding them of who they are and from where they come. Bards can be found among the followers of any religion, but most follow Aymara, the Sister of Song.
Subclasses: College of Virtue

Clerics

Of all the mortals in service to the gods, it is clerics on whom the gods depend the most. These devotees pledge their lives to serve the gods, becoming tireless champions of their causes. They might found temples in which they can offer succor to the needy and religious instruction. Or, some venture into the world to fight the enemies of their faith. Each church has a clergy which is usually made up of priests and clerics, thus most clerics devoted to specific deities join the appropriate orders or, less likely, belong to a corrupted or heretical group. Clerics sworn to the Lords of Heaven pantheon typically join The Great Church.
Subclasses: Air Domain, Balance Domain, Beauty Domain, Creation Domain, Corruption Domain, Earth Domain, Fire Domain, Madness Domain, Repose Domain, Travel Domain, Tyranny Domain, Water Domain

Druids

An ancient order devoted to nature in all its forms, druids nurture the land, protecting it from despoilers and destroyers. Druids do not usually join the churches of the other gods, for their temples are in the wilderness, their gods found in the beasts in the fields, the trees in the woods, and the stars in the sky. While some druids might have affinity with the old gods, most instead see themselves as servants of Eliwyn, the Tree of Life from which all living things spring.
Subclasses: The Tree of Life Circle

Fighters

Although committed to attaining martial mastery, fighters can be as devout as anyone, seeking comfort and inspiration from the gods. Some fighters honor all the gods in the manner taught by the Great Church, offering prayers to whichever god might intercede on their behalf or who can give aid in a particular situation. Many fighters, though, have strong ties to specific gods, especially those who embody strength, valor, and the arts of war. Gods commonly worshiped by fighters include Terak, Morwyn, Mormekar, Maal, and Canelle the Red Sister. Evil fighters might pray to Canarak, Naran, or Asmodeus.
Subclasses: Hospitaler

Monks

The monasteries scattered across the face of the world offer ways to attain enlightenment. What enlightenment means varies from monastery to monastery. For some, it could be to unite body and mind to transcend the limits of the physical form and for others, it might mean to become one with the universe. While the methods and motives vary, almost all monasteries find their roots in the efforts of Kunar, who left the Great Sphere to become one with The Nameless One.
Subclasses: Way of Iron

Paladins

The holiest of warriors, paladins take up arms to fight injustice, tyranny, and wickedness. By swearing sacred oaths to the gods they serve, paladins gain a measure of divine power to aid them in their campaigns. Most churches described in this book have orders made up almost exclusively of paladins. The oaths these paladins swear align with how the order serves its patron deity.

Subclasses: Oath of the Ascetic, Oath of Battle, Oath of the Eagle, Oath of Mercy, Oath of Perfection

Rangers

As wilderness warriors, rangers roam the forests and mountains, walking the lonely roads between. Their knowledge of nature magic has much in common with druid magic. Thus, many rangers follow the old gods. Rangers honor the One Tree or worship Urian, Rontra, and, sometimes, Shalimyr. A great many rangers follow Thellyne, the Golden Sister, while evil rangers might worship Canarak or Thellos.
Variant: Hunter

Rogues

Rogues might engage in all manner of skullduggery, but they need the gods just as everyone else. As rogues find themselves in tough spots, few rogues find it hurts their situation to offer a quick prayer to whatever god might be listening. Some feel drawn to unrestrained Zheenkeef, while those dealing in death as assassins might follow Mormekar, but it is Darmon, the patron god of rogues, who draws them in the greatest numbers.
Subclasses: Vanguard

Sorcerers

As the innate ability to command magical power can arise in anyone, sorcerers come from a variety of backgrounds and religious beliefs. Their religious views might evolve with the understanding of their power’s source or it might reinforce their commitment to their patron gods or turn them toward gods with magic in their portfolios, such as Tinel, to gain understanding of their gifts. Some sorcerers receive their magical abilities from the gods directly, in which case the sorcerers might join one of the orders of their church or become an agent for their church. Zheenkeef, for example, touches the souls of people who interest her to awaken power within them. Most touched in this way join The Joyous Brotherhood, the second order of the goddess’s church.
Subclasses: Divine Inspiration

Warlocks

Warlocks make pacts with otherworldly beings, many of whom are ominous and dreadful, pledging service in exchange for magical power. People with strong religious convictions do not readily make such bargains, as the power their patron holds over them conflicts with devotion to the gods. Warlocks who have religious inclinations tend to follow gods of magic and knowledge, such as Tinel or Zheenkeef, or, possibly, one the servants of these gods.
Subclasses: Oracle

Wizards

The pursuit of magical knowledge might not leave much time for reflecting on religion or the gods’ ultimate purpose, but many wizards have ties to the gods and a few even serve them directly. As with members of other classes, wizards favor gods whose portfolios overlap their interests. Many wizards adopt Tinel as their patron god, as this power is the god of magic, knowledge, and the truth. As well, Korak, the god of the forge and artisans, counts many wizards among his followers, especially those interested in crafting magic items. Evil wizards favor Asmodeus, Thellos, or Naran.
Subclasses: School of Wright

For a quick breakdown of the esoteric classes found in Classes in the Mortal Plane:

Artificer
Artificers fit in well with the magical and creative worlds, and are the most religious of the esoteric classes. They often worship Zheenkeef, Aymara, Tinel, and sometimes The Nameless One as the creator of all. They are well loved by the divine and often blessed by them, and they in return are generous with their tithes.
Blood Hunter
Blood hunters often feel abandoned by the gods, which is why they turn to such drastic measures to accomplish their goals. If anyone, they turn to Terak, Mormekar, or Maal, the judger of all. Blood Hunters of a forsaken race, however, may resent Maal and refuse to worship him even as the lord of justice and law. 
Witch
Witches are the embodiment of self-sufficiency. They do not consort with gods because they feel that they do not need to. Some, however, will turn to Tinel as the god of knowledge and wisdom and white witches will turn to Morwyn for guidance. Not all witches are good, however, and a few evil witches may worship Naran as a god of strength and authority.
Warden
Wardens worship nature. They normally elevate Rontra and Thellyne as protectors of the earth, but just as many choose to reserve their piety for the trees themselves. Very few choose to honor Eliwyn.