I DO believe in the big bang theory
You don't have to believe in big bang theory. There is no point to do that. It's the same as to say i do believe in e=mc^c or m1*m1/r^2 and you know what? m1*m2/r^2 isn't true, e=mc^c isn't either
Oh and good point about the purpose of life.
Btw, Einstein didn't like the idea of Big Bang at all, did you know that Big Bang idea were created by a priest, and he said that the universe were created.