Believers should not get upset if others don't believe the …

Believers should not get upset if others don't believe the Bible. But we should care about warning others, so that their blood won't be on our hands when they go to hell:

“When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thine hand.”Ezekiel 3:18

“Trust in the LORD with all thine heart; and lean not unto thine own understanding.”Proverbs 3:5

“There is a way which seemeth right unto a man, but the end thereof are the ways of death.”Proverbs 14:12