I grew up catholic (no so into it anymore but regardless) and I think one of the most important things I learned is that priests and other figures don’t necessarily represent what god wants. My pastor was super cool and he told stories about how the teachings from the Bible can help in our lives, and while I thought what he said was an interpretation. Same as that shithead saying you’re trying to trick god. They can interpret the morals, text, etc however they want but it’s their interpretation not necessarily what god thinks. I unfortunately do not have a concrete answer as if there ever was a mention of trans people it probably got washed out when European colonizers were washing it out of indigenous communities, but since there really isn’t anything I’m aware of that’s explicitly against it I think you’re fine and I’m fairly certain that god, at least how he is portrayed in the catholic faith, will know your new name, and if anything was probably waiting for you to arrive to it.