All I meant CA is that** if person is in bad habits, you can talk about what quran or hadees says about that bad habit and he may listen cause after all he has some religious influence.** You gave one example and I agree that there are exceptions, such as the example you gave.
I won't argue with you but according to my experience, there are A LOT of Muslims in this world who pray 5 times but wouldn't care to follow the corret way of Islam even if we try to give them examples from quran/hadees. Different muslims have different priorities I guess. Some will just give excuse that all will be forgiven once they do sajdah and ask for forgiveness from Allah.