ANSWER: Very minor things, actually, for the most part.

EXPLANATION:

You see, the denominations are all part of the Christian Faith. Diversity among people over time just split them into different groups.

You may hear pastors or Christian comedians joke about denominations. Well, some of them are so similar, it's hard to tell the difference sometimes. One comedian (I forgot who) described Nondenominational churches as "Baptists with a cool website."

Here are some differences:

Baptists preform the Biblical Baptism, because Jesus was baptized, saying therefore, if Jesus did it, so should we. They also are organized in a congregational fashion, meaning that local churches are self-governing (unless it is a multi-site location.)

Catholics believe that the means of salvation aren't just being saved by God's grace and by faith alone, however, they believe that one must also "observe the sacraments." How ever, the Bible says that:

"For you are saved by grace through faith, and this is not from yourselves; it is God's gift — not from works, so that no one can boast" Ephesians‬ ‭2:8-9‬).

Methodists baptize infants.

These are some of the major denominations. Not all (obviously) are listed.