What we all know now as the church is so different from the Church of Christ.
People using the pulpit for self gratification and as cows as opposed to glorifying God and serving Him in truth and in Spirit.
In the Greek original of the New Testament, there are only 2 words whose sum of the letters is 666. Both of these words refer to the two beasts of the 13th chapter of the book of Revelation.
tradition —
παράδοσιν
παράδοσις
π = 80
α = 1
ρ = 100
α = 1
δ = 4
ο = 70
σ = 200
ι = 10
ς = 200
______________
παράδοσις = 666
Then came to Jesus scribes and Pharisees, which were of Jerusalem, saying,
Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.
(Matthew 15:1,2)
This is the second beast, it is similar to the Lamb, but persuades everyone to serve this world, that is, he persuades Christians to serve the first beast. This beast is a Christian religion in general.
The name of the first beast, according to the New Testament, is
prosperity or
wealth.
ευπορια (5 + 400 + 80 + 70 + 100 +10 + 1) =
666
prosperity (NASB)
—
... these he gathered together with the workmen of similar trades, and said, "Men, you know that our prosperity depends upon this business. (Acts 19:25)
wealth (KJV)
—
Whom he called together with the workmen of like occupation, and said, Sirs, ye know that by this craft we have our wealth. (Acts 19:25)
Hearing this word, the crowd of artisans who made idols, became furious, people became beasts:
If from human motives I fought with wild beasts at Ephesus <...> (1 Corinthians 15:32)
Of course, many denominations do not preach prosperity. Some denominations may even be prosecuted in some countries.
But the fact that instead of a single Church today we have denominations, testifies to the violation of the main commandment of God and Jesus Christ:
Hear, O Israel: The LORD our God [is] one LORD (Deuteronomy 6: 4)
That they all may be one; as thou, Father, [art] in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. (John 17:21 )
As you can see, the main obstacles that prevent people from believing in Jesus Christ are the denominations of the Christian religion.