I was atheist (not the militant kind, I just didn't care) before I studied math and physics in college.
1) Energy/Mass is conserved, meaning the universe had to be created. Something from nothing has never been observed.
2) The genesis story in the bible, while the timetable isn't perfect, is generally describes how the solar system/earth/evolution happened. It's sort of creepy.
3) The Fermi Paradox
4) Humans have been breeding cats and dogs from wild animals, I believe they are more intelligent, anyone with a pet they care about would agree. If this keeps up for another 10,000 years they will probably be even more intelligent. I believe someone screwed with primitive man's DNA; not in a corny Star Trek way, but it doesn't seem random.
5) Fire--->Steam power---->Internal Combustion Engine---->Nuclear power. The physical world seems to be setup to where we can't exploit nature unless in a consecutive laborious manner. Why isn't there a chemical reaction that rivals nuclear power? Were stuck on this damn planet with these crappy rockets.
There are allot of strange coincidences that don't match up with "random".
Oh I forgot.
6) If the cosmos, universe, or whatever you want to call it is so infinite and grand and wonderful then everything you can imagine is happening right now simultaneously somewhere out there, including waking up from the dead. Right now, somewhere out there on a planet with low gravity, a flying spaghetti monster has evolved. Atheists have no imagination, no offense.