Keller remains famous for his urban Christian ministry
Keller made a fundamental human error: he believed that he knew the will of God and other people don't. He thought he knew how God wanted everyone to live. When confronted by the reality that people don't all live that way, Keller failed to change his way of thinking. Instead, he condemned people. He said, "Violating God's will for sexuality, as it is written in the Scripture will de-humanize you." (Tweet of April 2, 2021 from @timkellernyc.) "De-humanize." We are all humans. When his belief in God led him to deny the humanity of our fellow humans, to de-humanize them, he took a wrong turn. If you prefer a Christian phrase, "If then the light within you is darkness, how great is that darkness!" (Matthew 6:23.) Let's not forget that Keller made darkness out of light in this instance.