I assume you mean denominations in general. They started in Bible times. 1 Corinthians 1:12 says Now this I say, that every one of you saith, I am of Paul; and I of Apollos; and I of Cephas; and I of Christ.
Chat with our AI personalities
Jesus Christ and the apostles started the Catholic religion. After that it was Martin Luther who started the Protestant Revolution (or Reformation) in the 16th century that began a landslide of new cults and sects that resembled falling dominoes for over 500 years and continues even today. Now there are tens of thousands of groups that could trace their origins back to Catholicism. It could take a lifetime to track down and list the names of all those responsible.
There is not "a" Christian denomination. There are probably thousands of different denominations; each of them is like a branch of Christianity.