If I can't see God why should I believe Him?

Just think about being a baby in your mothers womb. You don't "know" she exists, you cant see her or feel her. You might wish for a mother, you might wonder if there is more to life than what you see. Then you start to doubt, how can there be anything but what is right in front of me. You think that little womb is your whole life, you cant imagine ANYTHING outside of it. Then bam... you are born......I think of this life kind of like that. Metaphorically speaking of course.