Actually, the only place in Scripture that comes immediately to mind that states what congregation is the church, is the Corinthians church.
1 Corinthians 12:27 Now you are the body of Christ and individually members of it.
And of the churches listed in Revelation 2 & 3, the one at Rome is NOT mentioned.
You have your work cut out for you proving from Scripture what the *true* church (by that I presume you mean denomination) is.
The REAL problem is that some FRoman Catholics know that the true church is ONLY all the redeemed from every tongue, nation and people and it is their own pride AND stubbornness that prevents them from admitting that here. They refuse to acknowledge that it is faith IN Jesus Christ and not in a "church" (i.e., their own version of it) that places one into Christ's body, His bride.
When Peter was asked, "What must I do to be saved?", he answered, "Believe on the Lord Jesus Christ.". Jesus said, when asked what one must do to do the works of God, said, "This is the work of God, that you believe in him whom he has sent."