Daily, really, yes. Because as you are bound to be well aware, in many African countries (Uganda springs to mind as one of the worst), gay people are not free to love who they love, marry who they love, have a family life with who they love. The laws of their country forbid it and they risk jail. Uganda tried to introduce the death penalty for gay sex and was only dissuaded by the threat to withhold international aid. And all of this is enthusiastically aided and abetted by the Church in those countries - often the Anglican Church.
Why do you not want to believe that when a quick Google will tell you it is true?
On the matter of sin and sexual immorality, the list of what is considered mortal sin varies between and within Christian faith branches, but if you look at the lists available, matters of sex occur with a frequency bordering on the obsessive. And yes, sexual immorality and murder are often on the same list, i.e. a list of mortal sins.
i've also just been down an interesting rabbit hole about the concept of 'porneia', which some Biblical scholars take to include sexual acts between a man and his wife if they are not intended for the purpose of procreation. So by those rules, mutual masturbation between a married couple is a mortal sin. Can you see how ridiculous that looks in the context of the moral world?
It would be so much better if religions (all of them!) kept their noses out of what consenting people of age and free from other relationships do together in terms of sex. It's prurient, controlling and pathetic and I take issue with it as an atheist because those concepts are still used to justify the drafting of laws that lead to oppression and persecution. I'm a human being with a conscience and so that matters to me.