[Dinglesberry]

it doesnt have to necessarily be religious bigotry, it might also a culture thing, like I said above, some may just hold on to traditional values of a working father and caregiving mother, for example places like Japan and other Asian countries aren't accepting of homosexuality either even though theyre majority no religion and the 2nd most common is buddhism so idk, I don't know too much about buddhism but I would guess that a big part of it is to treat people with respect

In your case religion plays a part in it but I feel that there are many other factors as to why someone wouldn't accept their childs sexuality that transcend religion, and multiple different things can be a cause.