Answer:
Because he fell in love with a religious girl who attends church.
Step-by-step explanation:
The speaker shows how our interests can drastically change as influenced by external factors and which we have no control over, when he shows the exchange of interests that JB presents after he meets a girl he falls in love with.
JB, who had a keen interest in playing basketball, is now strongly interested in being religious and going to church often. That's because the girl he fell in love with is very religious and JB wants to participate in the same things as her.