You just described every animal on earth.
I assume that you are referring to my statement “...they essentially would be a different life form, from us, with different lifespans, probably significantly different courses of development, different perceptual abilities, a different history, etc. ...”
True. But, conscious robots, I think, could be on par or superior to us in terms of sentience. The other differences that I suggested (above) between humans and them could be even more pronounced than the differences that we have with other animals. Another fundamental difference would likely be in their manner of reproduction. All of these differences might make them less prone to fall prey to religious thinking. Or, as Vyazma suggests, if religious thinking did become a problem for them, a programming fix might take care of it.