@BPT thank you for the hat tip to my thread!!
And to the OP
Why would what your brother does in the privacy of his own room have an affect on your own level?
Going “OTD” isnt contagious unless you yourself make the decisioin to head that way. If your strong in your own beliefs then you will be fine.
Just focus on not driving your brother away with self righteous and hateful comments as I’ve seen happen in similar situations.