Men cannot save one another.
Jeremiah 17:5 Thus saith the LORD; Cursed be the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from the LORD.
Psalms 108:12 Give us help from trouble: for vain is the help of man.
Saving faith must be in hearts purified by God, not sinful and wicked hearts.
Jeremiah 17:9 The heart is deceitful above all things, and desperately wicked: who can know it?
Acts 15:7b And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe. 8 And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us; 9 And put no difference between us and them, PURIFYING THEIR HEARTS BY FAITH.
Men cannot choose who will hear the gospel.
John 6:44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. 65 And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.
Men cannot establish us, anoint us, seal us or give us the Holy Spirit.
2 Corinthians 1:21 Now he which stablisheth us with you in Christ, and hath anointed us, is God; 22 Who hath also sealed us, and given the earnest of the Spirit in our hearts.