Yes, his son is a sinner according to the Bible. My sons are sinners too, as are my daughters.
And the church-going Presbyterian claimed there is no Biblical basis for declaring homosexuality a sin.
The minister responsible for this failure needs to read the Bible and teach from it. I would consider myself a failure as a parent if my kids didn't understand the Bible better, and I'm not even a minister.
That “minister” had to have been in the PCUSA, not the PCA or OPC where all church officers are required in their membership vows to affirm the inerrancy of the Bible.