the question from Mr Orange was "how do you decide which deity you choose to follow? And do you ever worry that the ones that you decide not to worship might get a bit annoyed?". the point is, there are a number of claimed gods, how do you know you've picked the right one? if you haven't you're a bit screwed (possibly more so than the atheist who could plead that at least they didn't pray to another).
you've half given away the answer "...the Gods you believe in are the ones you are mandated to believe in by that faith". you are indoctrinated into a faith and accept its god(s).
Of course. It's largely down to geography and culture. But being "indoctrinated into that faith" renders the question meaningless. It only has any context to nonbelievers.