Well, if "all of those people" aren't real Christians then it doesn't matter what real Christians believe in because there's more of "those" and they're doing real harm whatever you want to call their faith.
It doesn't matter what you or I believe in when enough people who have the means and power to influence many people's lives seem to adhere to the Abominable Fancy doctrine and whatever subset of Leviticus is useful to justify their hatred.
Well hatred is hatred, and everyone recognizes it. That's why even so many non-Christians and non-Catholics loved Pope John Paul II and Mother Theresa, because they were filled with love and had no hate in their hearts. Saints just like these two have for thousands of years been drawing so many people into the Catholic Church, and encouraged them to love with a truly selfless love. St. Francis de Sales, St. Benedict, St. Terese of Liseaux, St. Augustine, so many, too many to count. They're inspirational to so many of us, and when we asked them "where did you get this love?" they keep pointing at God and especially Jesus in the Sacraments, so we go to Mass and try to become just like these saintly, holy men and women.
It doesn't matter what you or I believe in when enough people who have the means and power to influence many people's lives seem to adhere to the Abominable Fancy doctrine and whatever subset of Leviticus is useful to justify their hatred.