It's a complex situation where I don't think a one line answer is sufficient. I usually reference the following:
- the lack of science behind the born that way theory
- Michael Glatz who ran the gay magazine Young Gay America and walked away from the lifestyle and is now married to a woman
- Charlene Cothran who runs Venus magazine. The magazine used to be for lesbians but after Charlene left the lesbian lifestyle she now uses Venus magazine to tell others there's hope to leave the lifestyle
- that many have entered a homosexual relationship after a heterosexual relation
- that many have entered a heterosexual relationship after a homosexual relationship
- sexuality is fluid
- health hazards of the homosexual lifestyle from the CDC
- studies offering evidence kids do best in a heterosexual relationship
- studies offering evidence kids with homosexual parents are more prone to be homosexual, experiment with drugs and get in trouble with the law
- Chirlane McCray, the soon-to-be First Lady of New York City and wife of the Democratic soon-to-be mayor of New York City says that homosexuality is a choice. She should know. She chose it. Then she unchose it.
And more.
I think it's important to note the same-sex attraction isn't a choice most make, although there are some who admit to choosing the lifestyle. If it's not a choice and there's no evidence homosexuals are born that way, it's easy to see where people get confused. It's a complex subject.
•the lack of science behind the born that way theory And by and large the same people who promote this also believe people get to choose their gender - and can be born men trapped in a female body, or woman trapped in a man's body and need hormone / "gender reassignment" surgery to "fix" this "problem"... it is totally inconsistent, and is normalizing what is obviously a psychiatric issue.