It is not only Christianity, it is the ONLY, TRUE, COMPLETE Christianity on Earth....all other so called " denominations" are just that...either incomplete or in error, or both.
You sound just like Joseph Smith.
How long were you a Mormon?
So you admit that Catholicism is a denomination.
Contained within Christianity there are denominations, one of which is the Catholic church.
And in it are some Christians, NOT all Christians.
However, the church of Jesus Christ does include ALL Christians. That's the body of Christ.
Mormonism slates the same thing you stated and you are just as wrong as Joe Smith.
Catholics seem to use Mormon tactics a lot. Pretty Pharisaical