@CrusaderJerome I am not sure I understand what you are saying correctly?
As first argument you say some atheists affirm the statement "Judaism/Christianity is the only religion that has a realistic chance of being true".
How is that in any way a confirmation or even a support for that claim? Noone
knows what comes after death, otherwise we wouldn't have so many faiths with wildly different content at all. And just because judaism/christianity/islam (why did you leave the third big abrahamic faith out?) are the biggest faiths due to historic events doesn't change the fact that they were very local at the beginning. Which begs the question why an all powerful god that created all of humanity only cared for some local tribe in some valley and ignored 99% of the rest of humanity. Almost like every tribe had their own gods at that point and the sucessful tribes managed to spread their beliefs to the conquered ones ....
And why is it important that those saying it are atheistic and not, let's say Hindus or ?
And your final sentence " they would rather live out what they believe to be true" is pretty ironic, considering that non-atheists are the ones believing something they want to be true.
Which brings us back to what Kynnath said: There are thousands (if not millions when you would include those we never heard of, because they died out already) of faiths, believing any single one of those is likelier than the other already shows an inherent bias in your thinking, due to upbringing, education, social background. There is no proof. Otherwise it wouldn't be called
faith.