“It ain’t a myth and it’s not a religion.”
Nonsense.
I'll have to assume you meant the 'not a religion' part.
Buddhism is a nontheistic religion.
To many, Buddhism goes beyond religion and is more of a philosophy or 'way of life'.
You are right that some consider it to be a religion; but to me, a 'religion' with NO GOD at it's center is NOT a religion - but a philosophy/way of life.