Which church? There are thousands of them, they all say something different and all claim to be led by Jesus.
The problem is with the English language, Rose. For us, 'church' can mean a single congregation or a large organisation.
On the other hand, Greek used two words - 'ekklesia' and 'kuriakos'. Interestingly, in secular usage, 'ekklesia' was used to refer to civic authorities and assemblies (Acts 19 has it used in 3 different verses, to refer to the assembly of craftsmen (v.31/41) and a civil court or council (v.39)
In other words, it means the gathering of people (in our case, followers of Jesus) in a single location. The early translators, for whatever reason, chose not to differentiate between the umbrella term, kuriakos, and the locational term.
IMO they make it up to suit themselves, they imagine what he might have said.
Do you have eny evidence to back up that assertion?
There is no reason I should believe your church more than any other, that makes such claims.
Realistically, there is. It will depend on whether what this or that 'ekklesia' is teaching actually reflects what Jesus taught.