We know that. That's why it can't be considered science yet.
It belongs in the religious category.
This is just plain silly. Because it's a hypothesis, it must be religious? No, it belongs in the "we don't have enough evidence, so we should keep looking for more" category.
If nobody knows how life started, you can't rule out God.
Which is irrelevant. You can't rule anything out without evidence - but that doesn't mean that every conceivable explanation is equally probable. And given the problems with "God did it", it can hardly be considered probable at this point.