How did Johnny Cash feel about gay rights?

No interviews were conducted with this question as content, however because he was deeply Christian, it would be likely to presume that he thought of homosexuality as a sin. That said, one of his main beliefs was in forgiveness of sins - one of the main reasons he played many concerts in prisons. Also, if one was to look at his political opinion - Native American rights, anti-war etc. one could presume that he had no prejudices against gays.