What would be the effect, if the existence of alien life were to be proven, on the Judeo-Christian
philosophies of God which focus on earth?
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I'm not going to try to answer this, because I think that the science-fiction writer Phillip J. Farmer did a
wonderful job in several of his novels on just this theme. Try Night of Light; Inside Outside;the Riverworldseries; Lovers; Dare.There's also A Case of Conscienceby James Blish.