My gut feeling is proof of alien life be it the advanced space faring or some kind of space cabbage from Zeta Reticuli will only prove to be minor a inconvienience to religon. These kinds of people are used to taking the long view especially the Vatican which prides itself on its longevity probably.
Most people do not spend a whole lot of time thinking about these questions so there world view is unlikely or maybe that should be less likely to change with this being proved. Religons in the USA will likely split into two camps relatively quickly of an anti and pro nature given the cash generation potential from either position they will be relaeasing statements with blindling speed. The Vatican and Anglican world will naturally release a bland meaningless statement after probably a week or two of consultation within there respective religions which is likely to touch on the new testament ideas about spreading the gospel to others etc etc Islam will have no problems it is human politics that will have the problem.
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