Homosexuals cannot change their sexual orientation any more than heterosexuals can. It's not like a suit of clothes. God made us the way we are.
BOTH can, however, change their BEHAVIOR and become chaste if they weren't. We can't change our nature, our genetics...who we are. We can only change how we act, how we behave with other people.
With the help of God, His grace and prayer, we can become better people. Yes, it is hard work and God wroughts many miracles. Changing a person's heart, mind, behavior, soul is what He does....not their sexual orientation. That is genetic, just like being heterosexual....genetic.
Homosexuality is nature's error (probably sets of genes gone awry), an error that, as yet, can't be corrected. Nature makes errors sometimes, with children being born blind, mute, with awful diseases, with 6 fingers, brain damage, genital disfigurations, bi-homosexuality and so on. Homosexuality is one of the more PROFOUND abnormalities, but it is just that.
No amount of prayer changes genes....but prayer does change behavior. That's what we all want anyway.
What you say is completely at odds with the Bible.... Rom 1:18-32 is clear that homosexuality & lesbianism is NOT a natural behavior but is the final result in mankind's final depravity & rebellion against God. The Bible refers to homosexuality & lesbianism as vile, unnatural affection. It is absurd to think that God would program unnatural, abnormal, repugnant behavior into some human beings. That argument is straight from homosexual & lesbian talkng points, that "they have no choice in their behavior, it is part of their genetic makeup." That is hogwash and is not supported anywhere in scripture. We all have a sin nature, but we also have a choice in whether we choose to practice & exhibit moral behavior or vile, sinful, unnatural behavior.
1:18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;
1:19 Because that which may be known of God is manifest in them; for God hath shewed [it] unto them.
1:20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, [even] his eternal power and Godhead; so that they are without excuse:
1:21 Because that, when they knew God, they glorified [him] not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
1:22 Professing themselves to be wise, they became fools,
1:23 And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.
1:24 Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves:
1:25 Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen.
1:26 For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
1:27 And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
1:28 And even as they did not like to retain God in [their] knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
1:29 Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,
1:30 Backbiters, haters of God, despiteful, proud, boasters, inventors of evil things, disobedient to parents,
1:31 Without understanding, covenantbreakers, without natural affection, implacable, unmerciful:
1:32 Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.
I don't know where you are getting your junk science - Homosexuality is not normal, it is not genetic, it is not "the way God made them". Homsoexuality is a CHOICE. God created mankind with a plan for us - and homosexuality was not part of that plan. Homosexualitiy is just another on the list of sins brought about by man's disobedience.