Lyric discussion by Bazal 

Cover art for Savior lyrics by 30 Seconds to Mars

My take on it....it's about religion. He's saying why live for someone else, someone you can't even be sure exists. Why put so much stock in faith rather than what you yourself can do and be. This is his chance at life and he's going to make the most of it, his way.

No its not. Every single song Leto has wrote is about the same thing. Purpose in life. Look at what all of them have in common. It is the opposite of your response, he has found himself.