I am atheist in a very religious mould. I'm always asking myself the big questions. Where did we come from? Is there a meaning to all of this? When I find myself in church, I edit the hymns as I sing them.
I think it's imperative to follow your heart and choose a profession you're passionate about, and if you haven't found that 'spark' yet, if you're not sure what you want to do with your lives - be persistent until you do.