Dawah in principle duty of muslims TO BE selected nation

Dawah in principle is a duty of all muslims thats why we are selected nation
You are the best peoples ever raised up for mankind. You enjoin to good, and forbid evil, and you believe in Allah. (3:110) (Surah Ale Imran)

Invite  to the way of your Rabb (Islam) with wisdom (with the reasoning of the Quran) and excellent preaching and argue with them in a way that is better. Truly, your Rabb knows best 'who has gone astray from His Path, and He is the Vest Aware of those who are guided. (16:125).