"Why is homosexuality considered a sexual perversion by believers of God?" Not all of us believe that, deaar one. In fact, many of us go against scripture and actively promote gay sex.
"Homosexuality is a sexual orientation like heterosexuality and bisexuality. I know some homosexuals in their 20s who haven’t had no sexual contact with members with the same sex, so you can’t say that it’s a sexual perversion." Then urges to commit pedophilia are normal, too, and are not perversion as long as we don't commit it. That's your logic, dear one. Nonstandard use is nonstandard use. Don't fall into the trap of special pleading.
We have no direct control over what attracts or tempts us. There's nothing wrong with that. The good or the evil comes in what we do about it. Being attracted to members of our own sex doesn't necessarily mean that we are homosexual or that something's wrong.
"You religious folks probably think when someone is a homosexual or basically someone who isn’t heterosexual is filled with nasty and abnormal sexual desires which isn’t true at all." Nasty? I wouldn't know about that. Abnormal? Certainly, dear one. If we evolved, we evolved to have sexual interest in the opposite sex. You can't have it both ways.
"So how in the damm world can you say that if you aren’t heterosexual, for some reason you’re filled with nasty sexual and abnormal desires?!" I don't, dear one, but a lust for members of your own sex is abnormal, according to evolution. I'll leave the question of nastiness to others.
"Some people who aren’t heterosexuals don’t do abnormal sexual activities like you religious folks claim, and even if they do, that doesn’t mean that heterosexual people don’t do the same thing. Some heterosexual people do nasty crap so please don’t say that nasty and abnormal sexual activities are done by humans who aren’t heterosexual." I don't lay that down as a universal rule, dear one. Homosexuals are just as capable of resisting sexual sin as heterosexuals are. If anybody, gay or straight, wants to follow Christ, I will help him do so. What I won't do is encourage him in his sins, like so many other "Christians" will. I can't encourage gay sex any more than I encourage adultery or fornication. God has no double standard, only a high one.