Be a good model for him, let him love Allah and talk to him about the attributes and beautiful names of Allah, remind him that Allah watches him all the time. Allow him to play as this is human nature but also make him read pages of the seerah of the Prophet and memorize portions of the Quran in return to have a balance. Make lot of Duaa asking Allah to guide and lead him.

What are things that I can do to make my 12year boy love the religion.He always wants to play games.he does pray all the prayers but his prayers are fast.so how can I make him love the religion.