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The Church is the only way to salvation, like a bridge is the only means of getting off an island. I may know that bridge is there, and I may know where it goes, but if I'm lazy enough never to walk over it, I ain't gettin' off that island!

Grace is the bridge from God to man. We are saved by God's grace through faith in Jesus Christ as Lord, Savior and King.

Church is a group of like-minded believers, led by a teaching elder, who worship God together, and receive the Lord's Supper together, and acknowledge the gift of membership in God's family through baptism together, and preserve the Scriptural doctrines Christ and the apostles taught, all and only according to the word of God.

From the...

WESTMINSTER CONFESSION OF FAITH
Chapter 25
Of The Church
(note that "Of the Church" is Chapter 25 and "Of the Holy Scripture" is Chapter 1)

I. The catholic or universal Church, which is invisible, consists of the whole number of the elect, that have been, are, or shall be gathered into one, under Christ the Head thereof; and is the spouse, the body, the fulness of Him that fills all in all.[1]
II. The visible Church, which is also catholic or universal under the Gospel (not confined to one nation, as before under the law), consists of all those throughout the world that profess the true religion;[2] and of their children:[3] and is the kingdom of the Lord Jesus Christ,[4] the house and family of God,[5] out of which there is no ordinary possibility of salvation.[6]
III. Unto this catholic visible Church Christ has given the ministry, oracles, and ordinances of God, for the gathering and perfecting of the saints, in this life, to the end of the world: and does, by His own presence and Spirit, according to His promise, make them effectual thereunto.[7]
IV. This catholic Church has been sometimes more, sometimes less visible.[8] And particular Churches, which are members thereof, are more or less pure, according as the doctrine of the Gospel is taught and embraced, ordinances administered, and public worship performed more or less purely in them.[9]
V. The purest Churches under heaven are subject both to mixture and error;[10] and some have so degenerated, as to become no Churches of Christ, but synagogues of Satan.[11] Nevertheless, there shall be always a Church on earth to worship God according to His will.[12] ...

So the Scriptural truth is that God's children are found in a variety of churches faithful to the word of God, and membership in God's family by grace through faith, as determined by God from before the foundation of the world and made known to us at a time of His choosing by the gift of the indwelling Holy Spirit, is the true passport that gets anyone "off the island" and into heaven.

As God wills.