There is also a scripture in one of the writings attributed to Paul where he says I don’t preach where Christ has already been preached or something to that effect. Bottom line is if you believe in the Bible and it’s writings then it’s clear to anyone who actually reads it that the NT was all about the worship and belief in Jesus Christ and all those who believe in him would be saved.
Knowwhere does it say that only a certain groups of Christ’s followers or believers would be saved and all other Christians killed. John chapter 3 all who believe have everlasting life !!!