randcruztedpaul asked:

Why do you suppose there are several "denominations" in Christianity?

Because Man is full of sin, especially hubris, and is a race apparently incapable of digesting the Word of God. Paul engaged the Church in Corinth over the issue actually.

10 I appeal to you, brothers and sisters, in the name of our Lord Jesus Christ, that all of you agree with one another in what you say and that there be no divisions among you, but that you be perfectly united in mind and thought. 11 My brothers and sisters, some from Chloe’s household have informed me that there are quarrels among you. 12 What I mean is this: One of you says, “I follow Paul”; another, “I follow Apollos”; another, “I follow Cephas”; still another, “I follow Christ.”

13 Is Christ divided? Was Paul crucified for you? Were you baptized in the name of Paul? 14 I thank God that I did not baptize any of you except Crispus and Gaius, 15 so no one can say that you were baptized in my name.
-1 Corinthians 1:10-15

Protestants are particularly susceptible to this division it would seem. Fickle, loyal so long as the wind blows a particular direction and the sun is shining just so.

I often tell the story of how my grandmother’s church tore itself apart over the font size of the new sign it put up. It was one of the biggest eye openers I had to the failures of Protestantism. This is not to say that unity should be the end goal itself. On the opposite end are the Liberal Nondenominationals who allow anything and everything, whose only goal is unity (read “filling their pews and purses”) and “One, Holy, Catholic, and Apostolic Church” which is united in its heresy. It is no good to be united over nothing or united over heresy. Indeed it would be better to be an island in the world founded on God’s Word than either of those two, but that is not how God intended His children to live.

So there are denominations because there are false teachers, either malicious or simply misguided, and lazy Christians, who use “their” preacher as their translator for the Bible. The only way to comprehend the Bible is to have it revealed to you by God. That can indeed be through a third party, a preacher or website that helps you understand, but neither of these are substitutes for prayer and self-study.

Thanks for your question, if you have any more it is my utmost joy to answer them. Have a blessed day and be safe.