Outside of which there is no salvation... really?
The Word of God would disagree with this false theology. The Lord's church is not the giver or mediator of salvation.
Acts 16:30-31 “Sirs, what must I do to be saved?” So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.”
Acts 4:12 “Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.”
Ephesians 2:8-9 “For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.”
Romans 10:9-10 “That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.”
Second Corinthians 5:21 “For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.”
“...Outside of which there is no salvation... really?”
Really.
Q: Where did all those biblical passages that you quoted come from?
A: The Church
(End of discussion.)