“If they reject the religion, they arent jews.”
No, they are Jewish heretics.
"Of course I'm Catholic, I mean, with a name like Wladislav Przybyszewski, what else could I be?" (Last episode of Church-going: Easter, 1972.)
"Catholic? Bridget O'Malley? You had to ask?" (Religious conviction: there is nothing dumber than a religious conviction.)
"Josh Cohen, Jew, yeah, Jewish atheist. I promise you it's more atheist than any other kind of atheist."
So it tends to skew the statistics. I get the impression that an atheist from an Evangelical family will just be an atheist. That's it. They'd never call themselves Evangelicals. But no matter what you believe--- everything, anything or nothing -- the ex-Catholics and ex-Jews will still be there "identifying" as Catholic and Jews and messing up the Catholic and Jewish statistics.
I trust I have made myself sufficiently obscure....