This is self-explantory. But for the people who don't uderstand, it means following religious ideology will make you do just as many if not more stupid, pointless and "bad" things as you would doing drugs! Especially if you take it too serious!
You could argue it depends on the individual how they react to realigion and drugs. There's always a few that can't handle it or take it the wrong way. It's just a shame these people seem to make it to the top of the pile!
Anyway, it's a warning about religion! You DON'T need it in your life, think for yourself not what some rules written 1000's of years ago tell you to think! Some drugs are bad too! But as with religion it's the individuals choice to give themselves up to what can be a life long addiction and crutch.