What does Anthony Falzerano, who was once homosexual but then became a heterosexual, got married, and had two children, identify as one of the greatest threats to the gay movement?

He became an activist who took a stand against the homosexual movement.

Explanation:

Anthony Falzerano, claimed that he had been homosexual, but that he became an ex-gay when starting a relationship with a woman with whom he had children. However, Falzerano's new phase of life transformed him into an activist who took a stand against the LGBT movement, supports the institutions that preached the existence of an alleged "gay cure", in addition to making horrible statements about the existence of homosexuals, how to claim that they were the vehicles used by Satan to spread AIDS to good and honest people.

His highly prejudiced and insane comments made him a major threat to the country's LGBT movement.