I understand your position.
On the other hand, there are folks on either side of this debate who do not share your assurance that all are "Christians" who are all destined for Heaven.
On the contrary, it can be said that the belief in this "Fairy tale" of perpetual virginity is evidence of the Catholic being slavishly devoted to his institution and lacking the faith in the Bible alone and Jesus alone as required for salvation.
On the other side, the persistent denial of this virginity and the Church that teaches it and other Traditional Christian ideas is thought to emperil the soul of the "just plain" Christian believer.
So either side has sincere motives to make the other side see the danger in its beleifs.
SD
Apparently familiarity with the Bible is not a necessity in your belief?
Matthee 7.21 Not every one that saith to me, Lord, Lord, shall enter into the kingdom of heaven: but he that doth the will of my Father who is in heaven, he shall enter into the kingdom of heaven.
22 Many will say to me in that day: Lord, Lord, have not we prophesied in thy name, and cast out devils in thy name, and done many miracles in thy name?
23 And then will I profess unto them, I never knew you: depart from me, you that work iniquity.
All Christians going to heaven my foot.