happened to me.
i resigned from the cult. i stayed with my born in wife--we had 3 kids ( girl--boy--boy ). after 13 years of marriage i had an affaire--and my wife divorced me as fast as she could. she took my home and business in settlement.
i had regular access to my kids for a few years--then one day my oldest ( daughter ) said she didnt want to see me anymore. i carried on seeing my 2 boys---but it got more and more strained and it was obvious they didnt want to be with me. i sought professional advice--talked to their school teachers---and decided to keep away for a while.
a few years later i wrote to them--to try to start some sort of dialog going..all i got was one reply--from my youngest ( son )--saying he couldnt meet me as it was against his religion. ive not seen him now in 30+years.
years later--i found out my older son had got d/f'd. i found him through facebook.
long story short---we are now very close--hes 41 now . his mother totally shuns him.