How would Abrahamic religions end?

[littleendian]

The same way the Greek and Nordic religions and religions of old became extinct;

With the possible exception that a large number of horny old men will have to find different ways to get their hands on kids. And they will not have a multinational NGO covering up their "innocent fun" with an "infallible" dictator who chooses to ignore this "minor" issue and rather focus on the "major" issue of peoples personal lives, like whether consenting adults choose to wear a rubber or not.

Ah, that'll be the day.