Science cannot make statements about “healthy” or “good”. You must have theology for that.
Examples of biological conditions which are generally recognized as “unhealthy”:
Sickle-cell anemia: genetic
Cancer: genetic, radiation, bacterial, viral
Deafness resulting from in utero alcohol: chemical
So, as you can see, there are plenty of examples of conditions, caused entirely by biology, chemistry and physics which we do not regard as healthy. It is not valid to make the statement: “if it is biologically caused, it is healthy,” yet that is what the gay lobby wants us to believe. This has been their strategy for moving forward: use the civil rights movement as a model: to do that they must convince you “gay” is another kind of person, that “sexual orientation” is an immutable aspect of a person, like sex or race, or that they didn’t choose these feelings… The last one I believe, yet it doesn’t imply that their eroticized same-sex attractions are healthy.
So am I saying the causation of SSA doesn’t matter? No of course not. I’m saying if you are in a scientific argument with someone who is using a variety of facts against your position, facts you can neither verify or disprove, you don’t have to end up with “my authority says” vs. “your authority says”: you can use a presuppositional argument instead. Show that in their worldview their argument wouldn’t be valid even if their facts are true using the above evidential critiques.
So what does tell you “healthy”? Your worldview, your religion, your theology. The Bible explicitly forbids erotic same-sex activities in numerous passages Old and New Testament. There have been those who attempt to re-write the Bible to not say things it does, but a rigorous application of proper hermeneutics comes back to the original plain reading of scripture: no, two men are not allowed to have sex. Even under grace of Christ where “all things are permissible” still “not all things are beneficial”, and now we’re back to this concept of healthy – does something build you up or tear you down? According to Christianity, erotic same-sex activities tear us down. According to Christ, the sexes were inherently designed for heterosexual marriage, or as the case is: just “marriage” is inherently heterosexual. There is no such thing as a homosexual marriage: God never invented it. He didn’t do it then, and contrary to what some say, homosexual marriage is not a new work of the holy spirit.
The Bible places no conditions on its prohibition of erotic same-sex activities: in that way there are no valid arguments to be made in the Biblical worldview that result is supporting the ‘ok”-ness of erotic-same-sex activities.
So when does causality matter?
Causality matters once you realize you have a problem. I should stop for a second and explain why is seems odd that I alternately say that causation doesn’t matter but then it does. God has used a technique called “memoization” to tell us that same-sex erotic activities are not “ok”. In reality whether anything is good is only one thing: if it follows God’s plan. Zip zero end of story. Fortunately, for humans, he has clarified his plans for us: 1) love God with everything you are, and 2) love your neighbor as yourself. Jesus didn’t give these commands for the first time in the New Testament: these had been the highest laws the whole time. Jesus further clarifies “all of the law and the prophets hang on these”. Catch that? everything does relate back to a single goal. The law gives us lists of ways we can fail to comply with these top two commands. Computer scientists call this “memoization”, when an answer is very difficult to figure out, once you figure it out, you store it in memory (write a “memo”) so that the next time you need the answer, it’s there waiting for you. In reality, none of the 10 commandments present any kind of an action in which something other than loving God or loving your neighbor has gone wrong: think of them as a top-ten list of ways to fail God’s top command. So does the causality of erotic same-sex attractions matter in whether it’s healthy? of course, but God already gave us the answer, so whatever else you think you’ve come up with, sorry, you’re wrong.