I know i'm not going to change any Christians minds but i think i can knock some fence sitters off of the fence and help atheists with questions. That and the entertainment.
-'I disagree with what you say but i fight to the death for your right to say it.'
I would say get two shoals, one of like six guppies and one of neon tetra. Both are very colorful and active fish that are very fun to raise. Get only male guppies though or after a month or two its gonna be a bloody convention.