Summary: 5 New American Standard Bible verses about this

Acts 25:19 - but they simply had some points of disagreement with him about their own religion and about a dead man, Jesus, whom Paul asserted to be alive.

Acts 26:5 -since they have known about me for a long time, if they are willing to testify, that I lived as a Pharisee according to the strictest sect of our religion.

Colossians 2:23 These are matters which have, to be sure, the appearance of wisdom in self-made religion and self-abasement and severe treatment of the body, but are of no value against fleshly indulgence.

James 1:26 -If anyone thinks himself to be religious, and yet does not bridle his tongue but deceives his own heart, this man's religion is worthless.

James 1:27 - Pure and undefiled religion in the sight of our God and Father is this: to visit orphans and widows in their distress, and to keep oneself unstained by the world