Speak with mildness and respect. Without being preachy, give evidence of how the truth has affected you for the good.
فَأَرْسَلْتُ إِلَيْهَا بِٱلْبَرِيدِ كِتَابَ مَاذَا يُعَلِّمُ ٱلْكِتَابُ ٱلْمُقَدَّسُ حَقًّا ؟‏ .‏