Well, sure! E.g. in the Eberron setting, there are several sidebars explaining how some deities are worshipped differently, or represent different domains. There are also alternative pantheons, etc.Is it possible to worship two dieties? Or even to just create a theme and pick a few domains to go along with it? I can't find anything allowing this in the character builder.
Can you build custom dieties for homebrew games to use in CB?
Well, you can enter a deity name manually.I can't find anything in the CB that allows you to add a second diety. Nor can I find anything that would let me create my own diety. I thought it was supposed to be custom rule friendly. Anyone have a spare owners manual lying around?
I found where I can just force the feat (thanks for the tip) but it makes me worry that I might screw up something else. Once I force the 2nd feat, it shows me as house ruled. After that I won't be able to tell if I take another illegal option. Gotta work with what they give me I guess.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.