Bruce R. McConkie wrote: “There are different churches because there are different doctrines. No two churches espouse and expound the same plan of salvation. If all men believed the same doctrines, all would belong to the same church. The mere existence of a false church of itself requires the support of false doctrines, false ordinances, false teachers, false prophets. In the very nature of things, a false church, in an attempt to survive, must oppose the truth as it is found in the true church, and this includes opposition to true doctrine, true ordinances, true teachers, and true prophets” (The Promised Messiah: The First Coming of Christ, pg. 34).
To me this simply shows why there are so many denominations out there as well as single standing churches. There are many that will lump themselves under the title “The Christian Church” or "The Christian Religion," yet they are fundamentally different in that they do not teach the same doctrines and they do not have a leader who is also a prophet to declare and clarify doctrine, which is the pattern shown by the book we love and revere, the Bible.
I believe I belong to the one true church on the Earth. Do you believe your denomination is the only true church? If not, it may be time to re-evaluate what you believe.