If a person is homosexual and a non believer, well....you wouldn't expect their life to be free of sin, nor for them to care about their sin. When that person accepts Christ and begins seeking Him with all their heart, their sins are going to slowly, (or in some cases, quickly,) come off. Homosexuality is one of those. There is no way you can have Christ in your heart, be seeking Him and reading His word, and not be convicted of sin and be transformed.