Amen! Which is why Protestants can say with Scriptural certainty that no church on earth is perfect; only Christ is perfect.
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us." -- 1 Colossians 5:6-7
"For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known." -- 1 Colossians 13:12"Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?
Some churches preach more truth than others, while some have been led so far astray they practically deny Christ's accomplished, one-time atonement of His sheep. Indeed, some churches actually put stumblingblocks in the way of God's word, and vainly insert mediators between God and men other than Jesus Christ alone.
"And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird." -- Rev. 18:2
But we have His promise none of His sheep will be lost and eventually they will know their salvation is due to Jesus Christ alone.
My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand." -- John 10:26-29"But ye believe not, because ye are not of my sheep, as I said unto you.
If you confess with your mouth the Lord Jesus and believe in your heart that God raised Him from the dead, you WILL BE saved.
It doesn't get any more clear than that.