1 Thessalonians 5:21 tells us to "prove all things" and hold fast to what is right.
We should not accept what is not supported by the Bible.
Yet many churches, and the members do

The people in Acts 17:11 were praised as true children of God when they "received the word with all readiness of mind, and searched the scriptures daily, whether those things were so." These enlightened seekers of God knew that they had to confirm by Scripture whatever was taught them, or else their worship would be meaningless.

As God’s Word, the Scriptures are the authority for all doctrine. Man has not been given special permission to invent his own teachings or to follow beliefs outside the Bible. No church was granted the authority to deviate from the Word or add its own traditions. Yet, that is just what has been going on for 2,000 years through a vast assortment of dogmas that are nowhere supported in the Word. The Almighty punished ancient Israel repeatedly for turning away from Him and taking up the beliefs and customs of the pagans around them. He thundered, "Learn not the way of the heathen" in Jeremiah 10:2. To my shock I discovered that many church teachings began as compromises with heathen beliefs and practices. It is this unholy blending that is at the root of many major church doctrines today.

But in vain they do worship me, teaching for doctrines the commandments of men. Matthew 15:9