My son 17.5 years old doesn't believe in religion. He doesn't offer namaaz keep roza or pray or make dua. He doesn't want to attend majlis e Hussain. I do everything at home. This boy of mine now wants to convince us to marry him to a kaafir when he is 25yrs. I took him for ziyarat too in 2014 but ….I don't know what to do. I feel devastated. Please help. How should I tackle my son?

Kindly contact any local alim e deen who can help you and answer his questions and satisfy him
And please spend more time with him check his friend circle
Man is influenced by his friends.
Avoid eating outside.Be friendly and kind with him.
Recite ayah 74 from sura furqan in qunoot of your namaz.