The number of denominations is directly proportional to the amount of false teaching in the denominational churches. We are Gentiles. We are not Jews. God ALWAYS treats Gentiles different than He treats Jews. NOTHING, except Christ, that was ever taught to or given to Israel was given to today's Jews. The ONLY truth TO or ABOUT us today is found, ONLY, in Paul's 7 post-Acts epistles. The other 59 all-Israel books are not TO us or ABOUT us today.
The remedy to this is 2Tin 2:15, rightly dividing, Correctly Cutting, God's Word, whose purpose is to get rid of all the Jewish baggage we're carrying around. All that stuff was given ONLY to Israel and we'll never get it whether we believe it or not.
The denominations treat these 1000s of Israel ONLY things as a big smorgasbord and pick and choose what they like. Each denomination picks out a different assortment and, thus, you have, supposedly, 40,000 denominations. None are given the eyes of understanding to see the TRUE Hope of their calling, Ephesians 1:17-18, in Paul's last 7 books, because everything those preachers believe is based on what Israel was given and not what we Gentiles are given. NO EXCEPTIONS!
Here's a very short list of things given ONLY to Israel. There is ZERO indication that ANY of these things were EVER given to today's Gentiles. When the Bible is silent, we MUST also be silent.
---the Lord's prayer
---the Lord's supper,
---Christ's gospel of the Kingdom
---the Great Commission
---the churches in the Gospels and Acts (we have a brand new church in Eph and Col),
---the New Covenant,
---the sermon on the mount,
---all or any part of the Law,
---water baptism,
---the Gifts of the Spirit,
---the idea that we are the seed of Abraham and Abraham is our Father,
---the New Jerusalem,
---the idea that we Gentiles are now part of Israel, in any way, whatsoever
---and, of course, Satan's favorite ploy, the Rapture, his big lie that sucks people into Acts and keeps them out of Heaven