The churches in Revelation were named after their locations to set them apart and or to identify them.
In the dictionary it is defined as:
1. denomination - the act of naming or designating; a group of religious congregations having its own organization and a distinctive faith
Denomination | Definition of Denomination by Webster's Online Dictionary
In Revelation: Most of the churches listed had wrong beliefs, and only two of them were faithful churches. Yet, these churches that were faithful were named. Granted, I have listed myself as non-denominational on the forums because I find most churches today as not following God's Word, but if a believer wanted to start a church (that seeks to build a revival in getting back to the basics of the Bible), a name will in time be attached to what their church is called (Whether they want that to happen or not). I would not even be against a group calling themselves a specific name that helps to distinguish their beliefs in the Bible (if it is something that the Bible teaches of the utmost importance) and gives glory to God.
As for “isms”:
Everyone on planet Earth has an “ism” including you.
The letters “ism” merely expresses a doctrine or belief that you hold to within the Bible or it helps us to identify other beliefs that are unbiblical. To not be fan of their use is to not understand the basics of words and their meaning. For example: “Theism” is defined as the belief in a God. If you look up the word “Theism” in the dictionary this is one of its definitions. Granted, it is not provide a list of a perfect definition, because it should give us a definition as saying the belief in THE one and only true God. The point here is that surely you believe in God, so you would fall under believing in Theism. But I hope you hold to other beliefs that the Bible teaches. If so,... there is an “ism” attached to that belief to help us identify it.
This Calvinist is praying a contradiction. In true Calvinism: God is going to save who is going to save according to His will, and He is going to not save who chooses to not save. Praying to God to save His elect is a contradiction in terms. God has already decreed who will be saved & not saved in Calvinism. So prayer is useless in regards to praying for the elect to be saved because they will be saved according to God's decree in Calvinism. Take for example Matthew 9:38.
Matthew 9:38 says,
“Pray ye therefore the Lord of the harvest, that he will send forth labourers into his harvest.”
This verse does not make sense in light of Unconditional Election or Calvinistic Predestination. There is no purpose to pray that the Lord of the harvest will send forth laborers into his harvest because God has already decreed by election long ago those who will be saved, and those who will not be saved. Our prayers are meaningless to change God's will if we believe in Calvinism. That is why I believe Calvinism is unbiblical. Just reading your Bible plainly and believing all the free will statements within it will automatically refute Calvinism. But most of course would rather follow this odd belief for their own reasons.