If irrefutable proof of an extraterrestrial would most people stop believing in God?

No. Because most people would work it out as one of two possibilities.1: God is an All Powerful creator and in all the Universe, he certainly did not just create us. So the proof of extraterrestrial life, especially intelligent life capable of what we would recognise as communication would reinforce the idea that God simply created other life besides us.2: The extraterrestrial would be construed as the Devil and it would reinforce the idea that God wants us to "fight" him.

All you need to do is look at 35,000 years worth of human history to see that people don't just stop believing in something because of new developments. Time was disease was the will of God. Now we have vaccinations and it's the will of God to give those vaccinations to the less fortunate.So believe me, the truly religious zealots will find away to work God into the presence of extraterrestrial life somehow.

There was a time (16th century) that theologians believed that extra-terrestrials were a necessity of creation.

Some people would we all know that; but just because people will one day find out that we are not alone in the universe. It does't mean we will all give up on what we believe in. When that time comes some peoples beliefs will only get stronger.It will also bring the planet together in a whole new way.

Not world peace but a new way of thinking..... why do you think that alien visits are being covered up. Our leaders are afraid of what will happen when we all accept we are not alone...

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.