Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience, so that those who speak maliciously against your good behaviour in Christ may be ashamed of their slander. For it is better, if it is God’s will, to suffer for doing good than for doing evil. (1 Peter 3:15-17)
If evangelism has become tainted with the association with ranting and bigotry then perhaps it is because not enough Christians took to heart what Peter says in his first letter. What should characterise the messenger who brings the good news of Jesus, who gave of himself to redeem humankind, is contained in the two words translated as gentleness and respect; the evangelist should speak gently and respectfully.
God Breathed Words 