The following is a summary and description of the various cults in Crossfire.
Use the command crossfire-server -m8 to check if the information presented here is accurate.
(Note: You may need to have the server compiled with the DUMP_SWITCHES and MULTIPLE_GODS flags for this to work!)
The bold attributes have meanings as follows:

Description: Summary of the God's overall abilities
Name of god: Alternate titles
Name of the enemy god: Self explanatory.
Races: Names of races friendly to the cult. The priest of this cult has greater power over these creatures. In some cases the prayer “summon cult monsters” will summon these monsters to help the priest.
Enemy races: Names of races hated by the cult. “Holy word” prayers of this god may be used to kill these creatures.
Attacktypes: Attacktype(s) used by this god's avatar and by cult “cause wounds” prayers.
Resistances: How much damage will be subtracted from successful hits made upon the character by the listed attacktype. For non damaging attacktypes, the resistance value affects saving throw and reduces duration. Higher values are better.
Vulnerable: Given to a cult priest by the “curse” prayer. Also means the character takes double damage from the listed attacktype. For non damaging attacktypes, the resistance value affects saving throw and increases duration.
Attuned: The cult priest is attuned to these spellpaths. This means spells of this type are easier to learn, take less mana or spell points to cast, and cause more damage.
Repelled: The cult priest is repelled to these spellpaths. This is the opposite of Attuned - harder to learn, take more mana or spell points to cast, and cause less damage.
Denied: The cult priest is denied use of these spellpaths. That means you are unable to use or cast spells of this type.
Special: A cult priest has these additional benefits and/or restrictions.
Granted Spells: Unique spells only available to followers of this particular cult. The spells are obtained when the amount of Grace is the following:

1. low = 100 grace (= 50 without altar)
2. medium = 300 grace (= 150 without altar)
3. high = 600 grace (= 300 without altar)

Altar Effects: Special effects (including weapon blessing) or abilities granted to the cult follower while praying over an altar, which are granted when Grace reaches the following:

1. low = 100 grace (= 50 without altar)
2. medium = 300 grace (= 150 without altar)
3. high = 600 grace (= 300 without altar)

Remove Curse: Removes curse property from all cursed (but not damned) items worn or carried
Remove Damnation: Removes curse and damnation from all cursed or damned items worn or carried
Remove Depletion: Removes all depletion effects, such as stat loss from death(s)
Weapon enchantment goes by the following:

1. enchant_weapon_low = weapon bonus +3 is max
2. enchant_weapon_medium = weapon bonus +7 is max
3. enchant_weapon_high = weapon bonus +12 is max

Devout followers (starting at level 10 in praying) can obtain twice the maximum amount of Grace by praying on an altar dedicated to their cult/god

Holy Relics: Special items granted to the cult follower. Items are granted when Grace level reaches:

1. low = 100 grace (= 50 without altar)
2. medium = 300 grace (= 150 without altar)
3. high = 600 grace (= 300 without altar)

Rarity is a measure of the chance of obtaining the item while praying over the alter. This can be influenced by the characters Luck.
Avatar: Dimensions and stats of summoned Avatar with a link to the full stats in the Spoiler
Holy Servant: Dimensions and stats of summoned Holy Servant with a link to the full stats in the Spoiler