Look after? I don't see any sign of it whatsoever. In fact, I see many signs to the contrary.
For hundreds of years the evidence has been accumulating to the point where today we have a darn good idea how it all came about. The recognition that the evidence is meaningful is the logic.
Sorry but I don't entertain questions that are in reply to my question. Can't answer, then you can't answer. I understand..
The logic is the lack of a better alternative.
Postulating that some being in the sky is responsible, when there is no evidence whatsoever, is hardly convincing, or even worthy of consideration.
How many of us would be left if god had not wiped out all of civilization (save for the fortunate eight) in the great flood? In any case your reply is irrelevant. That one of the essentials for life exists only goes to show that without it we would not be here, at least in our present form. That you want to credit god for putting water here is fine, just provide the evidence. And ancient writings about the supernatural, which have been passed down through the ages do not qualify. We have many such writings besides the one you adhere to, and with much different stories about your "perfect harmony." So, if you want anyone to believe your stories are better than all the others then you have a considerable task ahead for yourself.