I’m glad your Christian church is open and affirming. So is mine. If there’s LGBTQ+ people out there who would like to try going to an open and affirming church, I can recommend UCC.org
But we can’t and mustn’t deny that a lot of Christian churches have been and absolutely still are hateful towards people who are LGBTQ+ and force them to try to hide or deny their identity. The mealy-mouthed “Love the sinner, hate the sin” means they’re just trying to deny their own sin by pretending they aren’t breaking “and love thy neighbor as thyself.” To just say such people and churches are not “actual Christians” is denial at its laziest and enables them to continue unchecked.
And don’t get me started on whole denominations that refuse to allow women to fill positions of power such as pastor or priest. They’re not going to be ordaining any trans people either.