If you love the word of God, wouldn't any teaching adding or subtracting from it make you upset?
Psalm 119:104
Through your precepts I get understanding: therefore I hate every false way.
Acts 13:9-10
Then Saul, (who also is called Paul,) filled with the Holy Ghost, set his eyes on him, And said, O full of all subtilty and all mischief, you child of the devil, thou enemy of all righteousness, will you not cease to pervert the right ways of the Lord?
As I read the scriptures over the years, and learned its truths, I began recognizing errors is many churches (of all varieties - Catholic, Protestant, Non-denominational, etc.).
Praise the Lord that I am free from every Christian sect that relies heavily on men's traditions!
John 8:31-32
If you continue in my word, then are you my disciples indeed; And you shall know the truth, and the truth shall make you free.
Many professing christians are prisoner's of whatever tradition they have been raised up in and they can only escape it by hearing the word of God without the leaven of men.