Keep in mind that unlike your world, magic truly exists in Mystival and the Gods really do exist as is evidenced by the magic given to their priests. So the people do at least generally respect the Gods and priests. They may not be devout followers on a daily basis but they cannot ignore the fact that their fate in this world, and their fate in the afterlife, can be and is influenced by the Gods that really do exist.
In the Kingdom of Olden, among the Humans, there are two main religions that are followed by most of the Humans and one cult that is secret to most of the population but is know to exist by the "people in power" and the heroes. The two religions that are followed are the Greek Pantheon, which is slightly changed as envisioned by Frank Slattery, and the Church of the Redemption, which is modeled after the Catholic Church of the Middle Ages, but without most of the corruption that was reported to be in the real Catholic Church at that time. The Cult that exists is the Order of the Empty Crypt and is unique as Frank Slattery created it. See below for links to the Greek Pantheon, The Church of the Redemption, and the Order of the Empty Crypt.
The Elves mostly worship Corellon Larethian. As with the Dwarves, there are other Elvin Gods and I could elaborate on that should any player wish to delve into that. If you believe that Corellon Larethian is the God of the Elves, you are 95% correct and that will serve your character well.
Druids and Rangers sometimes just worship Nature. Or they can worship a God of Nature or a God with influence over the aspect of nature that they most admire. Like a Dwarven Ranger or Druid could worship Moradin as he has influence over the Mountains.
The Dwarves mostly worship Moradin but there could be some other Dwarven Gods should any players wish to delve into that. Moradin created the Dwarves and created the great mountains that they inhabit. If you believe that Moradin is the God of the Dwarves, you are 95% correct and that will serve your character well.