John 10:16 says exactly what you are denying.
Jesus will gather his sheep and they will be in one church--the whole of the believers in Christ. That's what you've been told by others here--not your denomination vs Luther's denomination vs. someone else's denomination, but one following that counts all the sheep is the church.
Must share the same faith
The new covenant unity:
Union with Christ the mediator and communion with God and the saints is based on “unity of faith”
“Thee faith” of the new covenant that all must believe without any error, false or strange doctrines foreign to “thee faith” of the new covenant!
“Thee faith” is found 31 times in the New Testament!
Obedience of faith: rom 16:26
Ephesians 4
I therefore, the prisoner of the Lord, beseech you that ye walk worthy of the vocation wherewith ye are called, With all lowliness and meekness, with longsuffering, forbearing one another in love; Endeavouring to keep the unity of the Spirit in the bond of peace. ...
Romans 12:16
Be of the same mind one toward another. Mind not high things, but condescend to men of low estate. Be not wise in your own conceits.
Romans 15:6
That ye may with one mind and one mouth glorify God, even the Father of our Lord Jesus Christ.
2 Corinthians 13:11
Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you.
Philippians 1:27
Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel;
Philippians 2:2
Fulfil ye my joy, that ye be likeminded, having the same love, being of one accord, of one mind.
1 Peter 3:8
Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:
Eph 4:5 one Lord, one faith, one baptism
2 Timothy 4:7
I have fought the good fight, I have finished the race, I have kept the faith.
Jude 1:3 Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort you that ye should earnestly contend for the faith which was once delivered unto the saints.
Athanasius Creed!
(From the early church)
Whoever desires to be saved must above all hold to the catholic faith.
Anyone who does not keep it whole and entire will doubtless perish eternally.
One church founded by Jesus Christ!
there is only one!
One God!
One Lord!
One savior!
One faith!
One new covenant!
One kingdom!
One household of faith!
One vineyard!
One church! (Not thousands of sects All teaching different doctrines all on the Bible alone, by the tradition of men)
Only Christ has authority to found the new covenant church! Matt 16:18-19
One shepherd one fold Jn 10:16
1 Tim 3:15 pillar and ground of truth
All men must be taught by the church!
Truth is revealed by God, fully by Christ, and must be proposed for our belief by holy mother church! Matt 28:19 Lk 1:4 Acts 8:31 eph 4:5 Jude 1:3 one faith
Unity of faith!
Four Marks of the True Church founded by Jesus Christ on Peter, the apostles, and their successors!
One, Holy, Catholic, and Apostolic Church!
