Catholic rules prevent priests and nuns from marrying, while forbidding specific food, such as meat on Fridays during Lent. Paul foretold these two requirements nearly 2,000 years ago, calling them "things taught by demons" and commends those who "point these things out to the brothers".
(1 Timothy 4:1-6, NIV)
The King James Version translation is more precise. The "certain foods" are identified as meats, "Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth." (1 Timothy 4:3, KJV)
Until recent decades, Popes condemned the eating of meat on Friday a "mortal sin" that damned a person to hell. The only method of averting this destiny was to confess that "sin" to a priest, to obtain forgiveness through him. There is nothing in the Bible that indicates God is honored when people obtain from meats on Fridays. The preceding verses state "nothing is to be rejected if it is received with thanksgiving." This verse permits believers to eat pork, which God had forbidden Israel.
It is incomprehensible that God set believers free to eat pork, then ordered believers to eat fish on Fridays.
Tradition - and things taught by demons
"The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons. Such teachings come through hypocritical liars, whose consciences have been seared as with a hot iron. They forbid people to marry and order them to abstain from certain foods, which God created to be received with thanksgiving by those who believe and who know the truth. For everything God created is good, and nothing is to be rejected if it is received with thanksgiving, because it is consecrated by the word of God and prayer. If you point these things out to the brothers, you will be a good minister of Christ Jesus, brought up in the truths of the faith and of the good teaching that you have followed."