This is not true, although I think I understand why you believe it. Faith is big in Christianity. Get Christians together and some will shameless brag about the strength of their faith. Not all of course.
But there is no faith in atheism, and there doesn't need to be because certainty is not necessary to hold a belief space empty. Certainty plays a much bigger role in Christian thought. And since faith and certainty dominate theist philosophy so much, Christians can easily project such a necessity onto others, even those who have zero faith and require no certainty.