This makes no sense. Why do you think Jesus built a Church? Surely to be a means of salvation, not an obstacle.
The Church is the Body of Christ, says St. Paul --- and under another image the Bride of Christ. Notice that both terms, "Body" and "Bride," entail that Jesus and Church are one flesh.
What God has joined together, let no man put asunder. You cannot truly encounter Christ and at the same time split Him off from His Body, His Bride.
But which (Eph. 5:25) refers to the universal body of Christ, which alone is only made up of believers who are baptized into it by the Spirit, (1Cor. 12:13) which is the one body of Eph. 2:20; 4:3, while the various visible churches are not. One cannot separate from the former, but must separate from one of the latter when it becomes critically aberrant.
Rome counts and treats even prosodomite murderers of infants as members in life and death, and the majority of her member are liberal, in contrast to her evang, counterparts, thus manifesting what she really believes, (Mt. 7:20; Ja. 2:18) in addition to doctrinally being critically in error. Thus requiring separatism from her.
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. (2 Corinthians 6:14-18)