Contradiction with Matthew 7:13-14
These verses suggest that the path to being a Christian is narrow and difficult, contrasting with the implication in Acts 26:28 that one might become a Christian "almost" or easily.
Matthew 7:13-14: Enter ye in at the strait gate: for wide [is] the gate, and broad [is] the way, that leadeth to destruction, and many there be which go in thereat: [strait: or, narrow]
Contradiction with John 14:6
This verse emphasizes that Jesus is the only way to God, which contrasts with the idea of almost becoming a Christian, as if there are different degrees or stages leading to Christianity.
John 14:6: Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Contradiction with James 2:19
This verse states that even demons believe in God, implying that belief alone isn't enough for salvation, which contrasts with the idea of "almost" being a Christian.
James 2:19: Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
Contradiction with Matthew 10:38-39
These verses emphasize the need for total commitment to Christ, contradicting the notion of being "almost" a Christian without full surrender.
Matthew 10:38-39: And he that taketh not his cross, and followeth after me, is not worthy of me.