Denominations developed out of a desire to have a different STYLE of worship. The theology and the doctrine, with the exception of how they worship, are essentially the same.
They all believe the Bible to be God's Word.
This is an irrelevant point as I have never mentioned right or wrong from a denominational standpoint but from the standpoint of what God's Word says.
What denomination are you or is this something you just personally feel?
Your spiritual unhealthiness is the result of you being at odds with what God says, not with what I believe. You lack faith that God's Word is His Word, and thus you're freed up to justify doing whatever you want.
Absent this Word that you believe to be fallible, you have no frame of reference for the person of Jesus Christ. This makes it impossible to have an intimate relationship with Him.
Spiritual unhealthiness is always marked by a rejection of the Truth given by God.
Your post is inaccurate. Christianity split into denominations often as a result of intense disputes over doctrinal issues. In the 19th century, one of the big doctrinal divides was how people are saved. Calvinists argued that people are saved by grace alone, and God alone chooses the elect. People can do nothing to ensure their salvation; only God chooses who is saved. Other denominations adopted a more Arminian view of salvation, insisting that people can choose to be saved, through faith. The Methodists were always Arminian in theology, in contrast to the Puritans, who were Calvinist. Both Calvinist and Arminian Protestants denounced Catholics, whom they accused of believing in salvation by works. And most Protestants denounced Universalists for believing in universal salvation.
The issue of slavery also divided American Christians and split several Protestant sects apart. The Baptists and the Presbyterians split apart over the issue of slavery. That's why we have the Southern Baptist Convention, with pro-slavery roots, and the American Baptist Convention, with anti-slavery roots, today.
Another doctrinal issue that split Christians into separate denominations was the issue of the Trinity. The descendants of the Puritans who believed in the Trinity formed the Congregational Church in New England, while the descendants of the Puritans who did not believe in the Trinity formed the Unitarian Church in New England.
The Disciples of Christ were founded as an effort to eliminate denominational divisions over doctrine and to bring all Christians together. The early Disciples, led by Alexander and Thomas Campbell, rejected sectarianism. Ironically, they wound up becoming another sect. But the Disciples are a non-creedal church, because of their effort to bridge the divides among Christians over creeds.