"In reality, homosexual relationships do not represent an authentic intimacy,...)"
And you know this because? No, I read the Bible and that's how I feel are not valid proofs.
"Such behavior harms bodies and minds, causing physical damage and spreading diseases, and leading often to depression, drug abuse, domestic violence, and even suicide."
Heterosexual relationships can also harm bodies and minds. Physical damage (a sign that you're really bad at se,) spreading disease, depression, drug abuse, domestic violence and suicide are not limited to homosexuals. Much of the depression, drug use and suicides are the result of the treatment homosexuals receive from a&&hats such as you.
"Numerous studies have documented the destructive consequences of the 'gay lifestyle,'"
Name them. Go ahead, cite a few credible studies which show that. Yeah, I thought so.
"although they should be hardly necessary if one merely considers the physical and psychological incompatibility of same-sex relationships, which substitute the natural complementarity of an opposite-sex companion in favor of a narcissistic parody of the same."
Physical incompatability? Ok, women have one less outie than men. So what?
Psychological incompatability? Who's to say? Probably the best judges of that question are the persons in the relationship. Certainly no one can decide compatability with a broad brush.
P.S. Is narcissistic parody why the Bible-belt has such a high divorce rate?