Doesn’t Paul backtrack on what he wrote in 1 corthinthians in 2 Corinthians? As far a 1 John yeah the Christians really we’re pushing their new god Jesus and anyone that didn’t believe in their new god was to be avoided.
My thought would be never deny belief in Jesus around Christians as far a Corinthians if your not doing these specific things then you should be left alone but let’s not forget is that many of the teachings of Paul were either forgeries or were contradictions of what Jesus supposedly taught.