It would really depend on what our new friends said, and believed. Example, if they claimed to be our creators, like many people already believe, that would definitely start a HUGE problem, with all religious denominations. This scenario would be very very bad, right or wrong would have no meaning anymore, I dread the thought of that happening, but I have a sneaky feeling that is exactly what we are being ‘primed’ for.
That would be the perfect excuse needed to outlaw religion, they will say continuing to worship our old gods is blasphemous and offends our new gods, it will not be tolerated anymore.