I suppose rationally, you cannot rule out the possibility, now matter how remote it seems. I would put it in the same category as UFO's -- lots of people will say there is evidence, but I still haven't seen any that's very convincing. And I'd love to believe they're out there. But I really can't.
Of course, aliens might not want us to have any evidence. I find the concept of extra-terrestrial life far more believable than that a omniscient divine being created reality. But it might not want us to have any evidence either.
The idea that some religion has an inside angle here is ridiculous. Without proof, anyone is free to make up whatever they want about "God" and no one, including God, is going to stop them. So why would I believe 99.9% of religious observations about this (preposterous) divine being is anything more than the human imagination at work? That's why
the fact of the matter is that religion is really and truly just about human politics. I have no doubt there. I'd refer you again to:
Occam's razor - Wikipedia, the free encyclopedia
This is a fundamental principle without which rational thought is not possible.