Two common arguments for why god exists...
"It's all too amazing to happen by chance, therefore god exists!"
- argument from incredulity
- misunderstanding of what "chance" means
"Science can't explain
X, therefore god exists!"
- argument from ignorance ("god of the gaps")
For a longer list (some quite funny) of arguments for god, see:
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http://www.godlessgeeks.com/LINKS/GodProof.htmAnd a more seriously worded yet quite good summary:
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http://www.godlessgeeks.com/WhyAtheism.htm(I have no particular preference for these sites, they just provided useful links).
Fundamentally, though, they all ultimately seem to boil down to the two I explicitly mention above and they are, in turn, founded on confirmation bias...proponents just want to believe! Of course, it doesn't have to be just good ol' Jehovah etc. you can insert any pseudo-deity or similar belief in here and have exactly the same irrational arguments put forward (I'm looking at you wiccans here...poke poke)