... Despite it not being an explicit Biblical teaching.
I just follow Jesus, read devotedly, pray incessantly, love God and others and spread the Good News by being all things to all people so that through me, some might be saved. However, what doctrines you hold to condemn me for not sharing supports name calling, e.g., not a 'true Christian', so be it. For not submitting to this doctrine, I've been called by fellow saints, not even a Christian. And more than that, not merely the anti-Christ but the devil incarnate!
It's one thing to discuss doctrine and learn from each other, such as the 300 page OSAS thread. However, when God's children resort to name calling, it does not bring salt and light to attract those who might otherwise be saved.
As someone said, this demonstrates that the doctrine of the trinity does not bring forth the fruit of the Spirit - and by their fruit you shall know them. Said differently, what authorizes you to condemn God's children to the Lake of Fire? You betray your name for your writings show you to be ByCondemnationThroughSelf-Righteousness. Your lack of humility reveals a Spirit not from God.