1}Well, if he doesn't convert--and barring invincible ignorance--he IS going to hell. 2}"Someone who is afraid of cultural progress". Acts that violate the 6 and 9th Commandment constitute "progress"?  3}What true Catholics are "afraid of" is the normalization of mortal sin.4} One does not "throw' a dogma "out the window" {here, the dogma of Extra Eclessia Nulla Salus}. He who does is a heretic. 5} The Church's teaching on marriage is also a dogma. And it is ignorant--at best--or dishonest--at worst--to suggest otherwise.