I mean if we encountered extra-terrestrial life, it could very well be vastly superior to our own civilization. That could easily conflict with many of the current world religions. Though I don't see how it could conflict with the stand-a-alone belief in a God
"I trust my own reason and my own capacities to think and educate myself and to reach greater levels of knowlege and status through learning and work. To me, wishing for a god is like wishing to be a slave, it is like declaring that one is too incompetent to handle one's own affairs." - the germans are coming