I don't. Faith requires a degree of crazy i would think. Believing in something you can't prove could definitely be seen as crazy to some, to other's it's faith.
The really funny part is, assuming you're a science only guy, is your belief requires a degree of faith as well. You believe in theories you'll never see proven and yet you believe in them. You'll say something like, "well i believe they are true because i have science to back me up..." to which we'll start discussing things like string theory and blackholes and multiverses at which point science as we know it and as we'll knwo it in your lifetime begins to break down and you'll have to place your faith that "someday we'll figure it out" otherwise you, like me, believe in something you cannot prove.
To that end you're just as crazy as a religious person...or a crazy person.