His family want him to marry a girl who is not religious and they say that she will change in time

No File Exists
Check below answers in case you are looking for other related questions:
Differences between Muslim and non-Muslim weddings
She is asking about marrying a man who plays soccer (football)

No File Exists
Related Answers:
He divorced her three times and she wants to marry a man who is on his deathbed so that she can go back to the first husband
Should i marry him
Are rizq (provision) and marriage written in al-Lawh al-Mahfooz?
Differences between Muslim and non-Muslim weddings
She is asking about marrying a man who plays soccer (football)

Recommended answers for you:
Ruling on shaving the beard
Rulings on the mourning of a woman whose husband has died
Ruling on a woman putting her picture on Facebook
Medical benefits of female circumcision
Examples of good deeds we can do every day to increase our hasanaat