The Sign of True Belief, is in its Followers, Doing the Right Things ... For, Religions, are the human devised versions, of The Word of God ...
The Word of God Is Truth ... The Word Is, Universal ... The Universal is that two Atoms of Hydrogen, and one Atom of Oxygen, in The Ordained Bonding ... Universally Constitute the Water Molecule ... and all its like Truths.
Check out ... if your Religion Follows the Universal Truth ... Check out, if what it Allows you, is Goodness, and what it Forbids is Evil ... Finally, check out what you Do, is The Right thing to do ... or you Practice Evil, in the Name of good.
Primarily, Evil, is what hurts fellow Humans ... for humans cannot hurt God ... but they can make Him angry, by doing evil.
Anyway,if all these Checks are Positive ... brother, you are not following a Tainted Belief, you are following the Right Religion.
P.S: Watch out for the Rationalized Goods and Reasons for doing Evils ... these are tainted Religious Beliefs, save yourself.