The following is why it is heresy to believe that homosexuals can’t change:
I think you are confusing same-sex-attraction (an involuntary feeling or response) with homosexual activity (an act of the will).
First, let’s define “heresy”: “…heresy is the obstinate post-baptismal denial of some truth which must be believed with divine and catholic faith, or it is likewise an obstinate doubt concerning the same…” (Catechism of the CC, 2089)
For it to be a heresy, we would have to show that it is a “truth which must be believed with divine and catholic faith” that homosexuals can change. There is no such teaching in the Catholic Church (see the official teaching in post #2…no mention whatever that we are to expect homosexuals to change their same-sex-attractions).
Next, we look at acts of the will. Sin is sin, regardless of the form it takes. A heterosexual can be just as guilty of sexual sins as a homosexual. The attraction is irrelevant. It is the act of the will, the choice to engage in sinful activity, which is sin. Having an attraction is not a sin in-and-of itself.
- Homosexuality is a disorder. Although same-sex attraction isn’t in itself a personal sin, it’s an imperfection and one of the manifestations of our tendency to sin as a result of original sin.
We ALL have a tendency to sin as a result of original sin. The fact that same-sex attraction isn’t in itself a personal sin is exactly why it is not necessary to believe that a person can change the attraction.
- We are all sinners (including homosexuals). God loves us as we are but loves us too much to want us to stay that way.
Stay what way? In a state of sin, or a state of certain temptation/attraction/etc…? Even Paul has his cross to bear. He even begged our Lord to remove that thorn from his side, but the Lord decided to leave the thorn. God wants us to refrain from sin…but He also gives some of us crosses to bear, or simply allows us to bear crosses that are a result of our fallen nature, choices, etc. It isn’t the cross that must change, but the choice whether or not to sin. The same-sex attraction need not change, but only the decision whether or not to act on the attraction.
- Christ tells is in Holy Scripture “You, therefore, must be perfect, as your heavenly Father is perfect” (Matt 5:48). In Revelation 21:27, it says that nothing unclean shall enter Heaven. That’s why we have Purgatory for those of us who die in friendship with God but have not been made perfect (see Heb. 12:23).
How do, as humans, work toward this perfection? We control our ACTIONS, despite our desires. In this work, it is possible that or desires will eventually change, but we are not guaranteed this. The work of being perfect is in the act of the will.
- With God all things are possible. Denying this shows a lack of faith in God.
Does not believing that a person can change his/her sexual attraction mean they lack faith in God? I don’t think this could be argued. Just because all things are possible with God, does not mean they will come forth. I believe God can make me win the lottery. That doesn’t mean He’ll make it happen for me though.