And the disciples came to the other side of the sea, but they had forgotten to bring any bread. And Jesus said to them, "Watch out and beware of the leaven of the Pharisees and Sadducees." They began to discuss this among themselves, saying, " He said that because we did not bring any bread." But Jesus, aware of this, said, "You men of little faith, why do you discuss among yourselves that you have no bread? Do you not yet understand or remember the five loaves of the five thousand, and how many baskets full you picked up? Or the seven loaves of the four thousand, and how many large baskets full you picked up? How is it that you do not understand that I did not speak to you concerning bread? But beware of the leaven of the Pharisees and Sadducees." Then they understood that He did not say to beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees. [Matthew 16:5-12 NASB]Religion is the enemy of Christianity.
The Pharisees and Sadducees taught a strict adherence to rules and rituals. Their traditions replaced God's laws, and their rituals replaced a relationship with God.
I see it widespread in churches today. Church tradition is more important than the words of scripture. In many cases, the teaching of the Bible is explained away or ignored. For example, there are many traditions that have no knowledge of the rapture, even though it is clearly taught in several places of the Bible. (The word "rapture" isn't in the Bible. That is a theological term taken from Latin, meaning "to be caught up".) "For the Lord Himself will descend from heaven with a shout, with the voice of the archangel and with the trumpet of God, and the dead in Christ will rise first. Then we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air, and so we shall always be with the Lord." [1 Thessalonians 4:16-17 NASB]
I once had a conversation with a woman whom I believe to be a sincere Christian. Upon hearing someone quote, "Put on the full armor of God," [Ephesians 6:11 NASB] she was aghast. "That sounds so militant. That's not very Christian." She had never been taught Ephesians chapter 6, nor about spiritual warfare.
There are a lot of spiritual leaders who cast themselves as spiritual professionals. "Don't try to interpret the Bible on your own. You lack the education. You need a professional to properly interpret it for you."
But the Bible wasn't written in scholarly languages. The Old Testament was written in Hebrew, which was spoken by all of its Jewish audience. The Greek language at the time the New Testament was written had two forms. There was a common form which the common people spoke, and there was the high form which was reserved for scholars. All the books of the New Testament were written in common Greek. The intention was that everyone should be able to read it for themselves and understand it.
I recently heard a preacher say that Christians still need to keep the laws of the Old Testament. As evidence of that, he quoted Jesus, “Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill." [Matthew 5:17 NASB] But we are taught in the book of Hebrews that we are under a New Covenant. (The words "testament" and "covenant" are interchangeable.) Jesus fulfilled the Old Covenant so that He could usher in the New Covenant by His blood.
"For this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put my laws into their minds, and I will write them on their hearts. And I will be their God, and they shall be My people." And they shall not teach everyone his fellow citizen, and everyone his brother, saying, 'know the Lord,' for all will know Me, from the least to the greatest of them. "For I will be merciful to their iniquities, and I will remember their sins no more." When He said, "A new covenant," He has made the first obsolete. But whatever is becoming obsolete and growing old is ready to disappear." [Hebrews 8:10-13 NASB]
Under the New Covenant, we don't obey law written in stone or on pieces of paper. We obey the Lord as He speaks to our hearts. We don't follow the rules established by another person, but we each know God individually, and He teaches each one of us, according to our needs.
He goes on to plainly say that the Old Covenant is obsolete.
Don't let religion steal away your relationship with God. The church rules and dogma are the leaven of the Pharisees and Sadducees. They will keep you so focused on what you should do and what you should know, that you will lose sight of Who you should know.