A:
If the reality is as you have mentioned, it will be permissible to advise and remind them wisely and kindly of things that reform and enhance their religion and affairs, and rid them of doubt and suspicion. Allah (Exalted be He) says,Surah Al-Nahl, 16:
125
Invite (mankind, O Muhammad صلى الله عليه و سلم) to the Way of your Lord (i.e. Islâm) with wisdom (i.e. with the Divine Revelation and the Qur’ân) and fair preaching, and argue with them in a way that is better.

May Allah grant us success! May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!