Remember that any church you attend, the Pastor/Minister/Priest had to attend his Seminary school or theological school. Those certain schools are not lead by the Bible really, but by the denominations like Baptists, Methodists, Presbyterian..etc, interpretation of what the Bible says.
That is why when you go, lets say, to a Baptist church, they will put a lot of emphasis on Baptism because that is their stance. And lets say, Presbyterians put a lot of emphasis on the 10 Commandments, which the Baptist do not do. Baptists really sorta disregard them as they believe that being baptised gets you to heaven. The Catholics believe more in the rituals and ceremonies along with the 10 Commandments. It's really much more in depth than that though.
Some churches teach, "Once saved, only saved," others believe Baptism at birth, some teach predestination while others do not and all this divides people. They believe that it is only their way that is correct and the rest of the people must be converted or they are forever lost. Some believe that speaking-in-tongues is a sign that you are filled with the Holy Spirit and if you don't believe like they do and speak in tongues, then you are not anointed and saved from Hell. Some teach, like the Seventh Day Adventists, that you must keep the 10 Commandments and that includes keeping the Sabbath, which is on Saturday or you will get annihilated. They don't believe in Hell as a place of torment, you just burn up once and for all. Others believe that the Sabbath is Sunday, but really it is not. The Holy Roman Church changed it from Saturday to Sunday around 364 (or somewhere around there) at one of their council meetings. They also voted on Jesus being God, otherwise he wasn't considered God at that time. It was voted in. It was also voted in about women having a soul or not, and Christmas, Easter and some other Holidays were instituted. Those original dates were pre-Bible and were Pagan in origin. It was just a way to bring the Pagans into the Christian church. Christmas is not in the Bible since it was written my Jews and the Jews don't believe in Christ.
The Christian church stole the Bible or at least the Old Testament/Torah from the Jews and then condemned them as of Satan because the Jews refused to follow the New Testament.
I'm rambling now. Lol, but do get a little bit of an idea what these schools are about? They divide people. They all have little rules that make them special unto themselves. They all focus on different aspects of what the Bible says and then they teach it as their main platform.
I first realized all this when I was visiting different churches and started paying attention to what Bible verses they were quoting. I was really puzzled why sometimes a whole chapter would be read, but leaving out one verse or a few and why they skipped around so much when reading. Why one verse? So, I started doing some research on it and it lead me to many years of it. Haha. I bought books and, well, it kind of became my little hobby. However, I lost a lot of friends because of this. LOL (sadly it really isn't that funny) I did lose a lot of friends because I was challenging churches believes. They would call me a heretic. And that's just not cool.