Bismillahir Rahmaanir Raheem
When we talk to a non-Muslim, we argue about his ‘book’. This is not the starting point of Da’wah (inviting to Islam).
First talk to the person about Islam: Its beauty, purity and perfection. In this manner, the flaws and loopholes of the other religion becomes evident and manifest.
If the person has an interest, he will ask questions. We should then answer the questions truthfully and with Hikmah (wisdom). There should not be an apologetic attitude when it comes to those aspects of Islam which non-Muslims frown upon, object to, or criticize. Everything of Islam has been established by the One Who is All-Wise and All-Knowing, for the good of man.
Attacking, vilifying and insulting the person’s religion, when inviting him to Islam, will lead to defence and attack from the non-Muslim, especially if he is a staunch adherent of his beliefs. He will also not want to listen further to our discussion, since he will consider anything derogatory to be blasphemous.
By Hazrat Maulana Yunus Patel Saheb