Christians, would you buy this NT?

[watchamadoodle]

Matthew 18:15-20 is in accordance with Paul's doctrine about expelling the evil person from the church in 1 Corinthians 5:9-13.

Here is what Geza Vermes says in "The Authentic Gospel of Jesus" p 364

The whole complex of sayings has a peculiar ring when set against the bulk of Jesus' teaching in the Gospels. To begin with, to compare a sinning brother to a tax collector is totally alien to the mentality of Jesus, who had a soft spot for publicans.
...
But above all, the reference to the church, twice in Matthew 18:17 and once previously in Matthew 16:18, clearly indicates that we are faced here with early Christianity and not with Jesus.

The gospels pretend to record the authentic biography and teaching of Jesus, so they should not put words from the early church into the mouth of Jesus IMO. That is why I would call those forgeries. Probably somebody felt the unlimited (70x7) forgiveness was not a practical way to run a church and "corrected" Jesus' teaching.