Theist: don't you know that the Big Bang Theory was proposed by a Roman Catholic Priest?

Yes, I knew that. Indeed, long ago I had the pleasure of meeting Professor Lemaitre. But I don't understand your question. He certainly never made his theological position a secret and Christian theists have long honored him for his contributions to his field. I get the impression that it is you who only recently discovered his background. Otherwise, there's no reason for you to bring up the question. In fact, you seem unaware that millions of Christians have always affirmed the Big Bang Theory. And as with Prof. Lemaitre and the Pope himself, MILLIONS OF THEM ARE CREATIONISTS AND BELIEVERS IN THE BOOK OF GENESIS!