Can one be saved who believes salvation is found in this denomination or that denomination? Would that not be denying salvation through Christ?
Rev 1:20 As for the mystery of the seven stars that you saw in my right hand, and the seven golden lampstands, the seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.
Chapters 2 and 3 of the book of Revelation lists those seven churches, so if someone says there is only one church they refute what the Word of God tells us.
“Chapters 2 and 3 of the book of Revelation lists those seven churches, so if someone says there is only one church they refute what the Word of God tells us.”
You are confusing local churches with The Church which encompasses the local ones.