Next to Catholicism, Lutherans, Evangelicals, Quakers, Shakers, Calvinists, Presbyterian, Congregationalist, Methodists....etc.., etc..., etc.
Every one is predated by the Catholic Church's Eastern and Western Rites by over 1,500 years. All forms of Christianity outside of the Catholic Churches are ‘new’. Some are just newer than others. Lutherans predate Mormons by less than three hundred years.
Of Course next to Judaism Christianity is a ‘new’ religion.
As for truly new Churches, Scientology would count. It is not a Christian Tradition in the least.
All Christian denominations agree that Mormonism is a different religion, not Christian.
The Catholics do not accept Mormonism as Christian.
By the way, Mormons claim that they are the only true Christian faith, that there was a void between the time of Christ and the return of the one true universal church.
Colofornian can fill you in on that kind of thing.