Exactly. My guess is that becoming (nominally) Greek Orthodox was his most extreme way of rebelling against his fundamentalist Christian roots. The G.O. part means nothing to him; it's just his anarchist way of contemptuously thumbing his nose at the faith of his father.
It is safer to assume that he had specific and respectable reasons for becoming Eastern Orthodox, reasons that had to do with the differences between Evangelical faith and practice and Orthodox faith and practice. Likewise, it is safer to assume that he has specific reasons (perhaps not respectable ones) for his current shenanigans.
If he had been a Catholic, as I am, or Orthodox, I would not assume that his current apostasy was aimed at hurting someone's feelings. Likewise, Evangelicals ought not take it personally. People leave our respective Churches, each for his/her own reasons all the time. Many return. His father was certainly a remarkable man. Maybe he will return to the Evangelical Faith when his current problems are resolved.
Love Frankie Schaeffer in spite of his faults and pray that God will grant him the graces and that Frankie will accept them to serve God's plans for him, plans which have to be better than yours or mine.
he was a bedwetter and his dad punished him for it
Then he should’ve joined the Episcopagans IMHO.