There are things a lot more complex than rocks, like people, water cycles, huge trees growing from a little seed... Besides, even if you don't think God is proven, it makes the most sense.
And food chains could've messed up a lot. Sure, putting something in an ecosystem you'd off throw it a bit, but what about taking something away? If food chains didn't have digestive tracks, or edible food, or decay or plant growth... Even one of those things would cause life to die out. What would be the chances of working complex chain caused by an explosion?
Just picture any complex thing. A brain, snakes, beautiful flowers... How could it.possible be a cosmic accident?