Instruct with Great Patience
Scriptural Evidence that Christians Must Debate

In scripture, the Christian Bible and the Islamic Qur'an give some very similar instructions regarding debating style. Believers must continue to debate patiently, courteously, kindly and with respect whenever they see or hear their own doctrine being absent or ignored. Believers shouldn't give up on trying to convince someone, saying things like "let's leave this until later", or "I don't want to talk about it" when asked difficult questions. Also, believers should not make assertions, saying "this is so!" without providing any proper information apart from exclamation marks.

The first verse means Christians must give reasonable answers to those who ask, whereas the second says that preaching must be active and continuous, presumably whether or not people have asked for it!:

“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.”

1 Peter 3:15-16 (NIV)

“Preach the Word; be prepared in season and out of season; correct, rebuke and encourage - with great patience and careful instruction.”

2 Timothy 4:2 (NIV)

“Let your utterance be always with graviousness, seasoned with salt, so as to know how you ought to give an answer to each one.”

Colossians 4:6

These verses are very simlar to Islam, see:

"Scriptural Debating Style: Christians and Muslims Must be Patient and Courteous" by Vexen Crabtree (2011)