Bahamut is very stern and disapproving of evil. He accepts no excuses for foul deeds. On the other hand, he is very compassionate, and has boundless empathy for the weak and downtrodden. He urges his followers to promote good, but to let people fight their own battles when they can, providing healing, information, or temporary safe refuge rather than fighting alongside those who can fight for themselves.
Bahamut's own greatest priority is his endless war with his sister Tiamat. He opposes all her schemes, answering them move for move. He values wisdom, knowledge, prophecies, and song. For a dragon, he is neither vain nor greedy.
Bahamut is revered by all good dragons, but gold, silver, and brass dragons hold him in particularly high regard.
Bahamut only accepts good-aligned priests. They may be dragons, half-dragons, or other beings. They strive to constantly yet subtly act on behalf of good. They oppose evil, but their first mandate is to ensure they do no harm in the process.
Temples to the Platinum Dragon are very rare. Those few that exist are beautiful, elegant edifices characterized by clean, simple architecture and furnishings. Within them will be public rooms in which the faithful can gather and private rooms for meditation and recuperation. Many temples to Bahamut are former lairs of dragons.
Dragons will not normally build temples, contenting themselves with simple symbols on the wall that they treat as shrines. Bahamut prefers his followers to worship him with deeds, not objects.
Most of the quests that Bahamut's followers go on are apt to involve opposing Tiamat in some way. They have few formal rituals. Instead of praying aloud, they count their deeds as prayers, supporting goodness and opposing evil. Bahamut cares little for mere words.
(found on wikipedia.org)