[krapp]

Not really. I think most religions don't have an issue with the premise of alien life. They would simply fold it into their existing theology, as they have every new paradigm-shifting discovery about reality. Even the Catholic Church's stance is that if aliens exist, they're just another part of God's design.

And there are already plenty of cults and religions that incorporate aliens (cough Scientology cough.) It's going to be difficult to compete against Nordics and Greys and hyperdimensional ascended masters and Xenu with some Venusian moss on a rock.