In new bible versions, changes have been made which have construed certain verses to teach Catholic doctrine. Among these are the following in the ESV which is the most popular among evangelicals. Follow along in your KJV to check these references.
Matt. 1:25 “but knew her not until she had given birth to a son. And he called his name Jesus”. This verse removes the word firstborn which strongly implies that Mary had other children; which refutes the Catholic belief of Mary’s perpetual virginity.
Again in Mark 10:24 “And the disciples were amazed at his words. But Jesus said to them again, ‘Children, how difficult it is to enter the kingdom of God!” This omits “for those who trust in riches” making this verse seem to indicate that one much work to enter the Kingdom of God.
Needless to say, Acts 8:37 has been completely omitted or bracketed by new versions. The significance of this is that it teaches that one must have faith before baptism. A very inconvenient truth for Papists.
1 Cor. 1:18 “For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God”. This “being saved” clearly says that salvation is a continuing process which fits nicely with any Catholic. Also, in 2 Cor. 2:15 “being saved” appears again.
James 5:16 “Therefore, confess your sins to one another and pray for one another,that you may be healed. The prayer of a righteous person has great power as it is working”. Confessing your sins is something you do to God, not to others. We are to confess our faults to one another as it is written.
1 Peter 2:2 “Like newborn infants, long for the pure spiritual milk, that by it you may grow up into salvation—” Growing up in salvation is a mentality that Catholics have. They believe that they are being saved but not until they die is their works complete.
All these changes are just some of the references which any King James Bible believing Christian can use to show that the new versions and the KJV do not say the same thing.