Think of it like this, do you need to be all-knowing to conclude square circles don't exist? How about all-knowing of mathematics to know 2 + 2 does not equal 5? You can absolutely rule things out without even knowing what the answer is. How about the mountains of evidence that all religions demonstrate the ignorance of humans, with not even advanced alien intelligence in sight? There is a natural order that cannot be avoided, which is always from simple to complex over time. Beginning with the most complex, magical super Being contradicts this unavoidable natural order, meaning just like the square circle, we can know enough to rule this out as any kind of possibility. We do have natural solutions to questions theists often ask. For example, energy cannot be created and thus works as an uncaused cause to get the ball rolling. Energy is also the simple building block found in all of existence so it also fits the natural order. When it comes to Gods, theists might as well be arguing for the existence of magical fairies. It is only through ignorance and superstition that Gods/Goddesses are created. That said, we also invented the magical Santa Claus and I love that concept and tradition. As a child, it was certainly fun to believe magic was real, but as a reasoning adult even though believing was fun, I cannot return to believing that the magical Santa is real. The same concept with Gods and religions, I find them interesting and entertaining but I cannot buy into them as a believer who has not gained as much reasoning skills to know any better.