Protestantism used to be known by the relatively small number of “standard” denominations, like Baptists (various groups of baptists), Lutherans (various Lutheran groups), Presbyterians (various different presbyterian bodies), A.M.E., Episcopalians,
Anglicans, Church of Christ, what have you.
Now there are so very, very, very many independent and newcomer groups of protestants that we are way beyond the ability to keep an accurate record of the different protestant groups. And beside the groups (those with say, 25 or more congregations of the same group), there also churches started by every Tom, Dick, and Harry or Harriet or has either a legitimate ministerial ordination, or even mail-order ordinations to the ministry.
Every Tom, Dick and Harry is starting his or her own “church.”
You can never have unity or common discipline in such a situation.