I wouldn't steal it because it's a fucking stupid idea.
If it was that stupid, then the world would be completely crime-free.
Let's say you become a banker. Someone hands you $42795 in cash and tells you to put that in his account. You can steal $50 and get away with it because he might not even know how much is in there. Would you steal it? A religious person wouldn't, because it is a sin. A lawful person might not, because of fear of getting caught.. but getting caught there is unlikely. A smart person might suspect that the cash is illegal, and believe that he's not hurting the world by stealing money from thieves.
Yeah you shoved all morality into religion as if morals only come from religion.
Nobody ever shoved morality into religion. It's a hypothetical situation where worldly enforcement would be very poor. I never said a non-religious person wouldn't steal it out of morality. No, that was the question and people aren't answering with a "no, because it's wrong, and by doing so, I hurt society", which is the most moral approach to it. "No, because it's stupid" is another lower layer of morality. "No, because i'd be tortured in hell for 20 million years" is the lowest level of morality, but it still discourages crime by discouraging stupid people from performing acts of crime.
Unfortunately, this whole religion discouraging punishment thing doesn't work, because only 10% of "religious" people actually practice what they preach. They don't actually believe in hell or heaven or punishment, etc, but use it as a way to discourage others from performing crimes. They pick out verses that support their views and completely ignore the ones that don't. By showing a fanatical support for their religion and forcing others to "believe", they're able to use it as a tool to manipulate people.
I see religion being sort of like supporting a sports team. Very, very few will stay loyal if they're losing, but everyone becomes fanatical supporters if it's winning. You get fist bumps, choirs, special greetings, special group rituals, etc. Fans of rival teams will fight and even kill each other to support theirs.
Problem with religion, or even believing in non-religion is that before death, you don't know who'll win.