When that person makes a commitment to Christ he must come into agreement with God that homosexual behavior is sin. You are initially offering him power to come into celibacy. His homosexual feelings are not going to change overnight. That will come with time and the care and concern of friends, and the quality of his own continued surrender to Christ. Actively, patiently love that person.
Words can be so empty.
Demonstrate your love by listening, by calling, by confronting when necessary, by sitting together in church. Love is an action verb. Listen with love and respond as Jesus tells you. Love them where they are at. Don't be afraid to touch or to hold hands in prayer.