Yes, it's an interesting hypothetical. If we were to have clear evidence of ETs, or even more dramatically, have contact with them, how would religions react. I suspect badly. Earthly religions would suddenly look very parochial, especially if advanced species were well and truly beyond this kind of thing. I suspect it worries religions, and the ruling elites of the world, should human perspective have such a dramatic change. My bet: they would denounce the ETs as evil, infidels, out of grace with God... etc... "It's not us its you." Long term, though, I believe it would be another death blow to religions through conscious raising.