faith is something one has, I guess, but one knows it when one has it.
I can eliminate answers by mutual exclusivity. There are four possible ways for the universe can exist, and three of them are absurd. Add to this list if you can think of any others, by all means.
1. circularity
2. infinite regression (turtles all the way down)
3. absolutism or "skyhook" i.e. "it just is"
4. self-reference

Thirdly, I'm not addressing you in particular on that one.
( Moon Girl Technologies horrendous beanbag, Thu 6 Oct 2011, 2:35, archived)

5. god made it.
6. someone shat it out of their arse

Both of these possibilities are equally possible.
( mike woz ere 7442200 & 7696970 getter, Thu 6 Oct 2011, 2:39, archived)

5=2 "gods all the way down" (who made god?)
6="god made it by accident"=2

or =3 if you prefer to say that "god just is".
( Moon Girl Technologies horrendous beanbag, Thu 6 Oct 2011, 2:45, archived)