Do not be deceived: “Bad company ruins good morals.” 1 Corinthians 15:33
There are many verses that teach we should not associate with those who are non-believers. Yet, not a single verse teaches Christians to kill non-believers, unlike the Quran, unless you take 2 Chronicles 15:12-13 out of context.
Other verses that I really like that teaches us this:
Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness? 2 Corinthians 6:14
“Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven. On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’ And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’ Matthew 7:21-23