That germ of Judeo-Christian thinking wasn't there to begin with. You can't imagine it there. It simply wasn't there. You are presuming that I'm some lapsed Christian. I'm working from zero.
Atheism is nothing new.
That's been going on for thousands of years. What is new, is that for the first time you had parents in the 50s, 60s, and 70s who found that it was liberating to raise kids without any religion. There's a small group, like myself, who were entirely secular. There's a larger group of Christmas Christians and Easter Christians who got those basic instructions about coping with the bigger issues in life, which in other cultures are simply handed to you on a platter when you're born. Then you have people like myself who reach a certain age when adolescence ends.