“discussing Christianity on the flight deck”
Is about a belief in sky fairies!
Sorry oicur but that can't go by without comment. With the risk of thread drift, I will mention just one point for you to consider - and especially relevant at 'Christmas' time: 'Christianity' involves belief in a historical figure of history, Jesus Christ. There is no question he existed in history (plenty of non-Biblical evidence). He was significant enough that for centuries history was marked as 'before Christ' and 'after Christ.'
Whether you believe he is what he claimed to be or not, he was certainly no sky fairy...
There is far to much political correctness these days and if people are so unsecure about their world view that they can't tolerate it coming up for discussion every now and then perhaps their comfort zone deserves to be challenged!