Whereu, I have had a similar experience of being told that the Scriptures have been corrupted by Muslims. What none have been able to explain is WHEN.
The timing is not that clear.
Claims of a large number of additions and changes to the original scriptures have been made. A comparison with a bible version that appeared about 350 years after the time of Christ and modern versions reveal a large number of additions and changes.
It is a fact of Christian history that the earliest Gospels did not record a resurrection of Jesus Christ, and that claim is supported in the oldest known complete Bible available to mankind today. Called the Codex Sinaiticus, or Sinai Bible, it was named after Mt. Sinai, the location of St. Catherine’s Monastery where it was discovered in 1859 by Dr. Constantine Von Tischendorf (1815-1874). The discovery of the Sinai Bible provided biblical scholars with irrefutable evidence of wilful falsifications in all modern-day Gospels, and a comparison identified a staggering 14,800 later editorial alterations in modern Bibles.