This is presented here. Interesting quote:
Analogically, the fact of the fine-tuned universe means the universe is life-allowing rather than life-prohibiting. This is very imporbable on atheism. This is not improbable on theism.
The main atheist objection to this is: multiverse theory. “If there is only one universe,” British cosmologist Bernard Carr says, “you might have to have a fine-tuner. If you don’t want God, you’d better have a multiverse.” (Discover, December 2008)