How doesn't religion stop people? Practicing muslims must follow halal, and are even (in some circles) supposed to follow shariah. Christians have dietary restrictions, activity restrictions, even work restrictions on the Sabbath. Hindus are predominantly vegetarian. The list goes on and on.i'm pretty sure religion doesn't stop people from things or force people since it's the persons choice. I also do not comprehend how you can claim that they're waisting huge amounts of their existence considering it's what they love and enjoy.
As for using up people's time, how is your Sunday spent? Or your Saturday? If your time is spent in a communal worship of a divine god, you're better off communally worshiping the divine easter bunny. Or the Flying Spaghetti Monster.