Belief and faith affects people's outlooks and decision, even if they do not always realize it. It can be for good or bad. Look at the Crusades - a very negative event that still affects our world centuries later. People do not sit down and say, "I'm going to invent something because of religion"; however, their environment always affects them, and religion is part of their environment. You cannot separate one part of someone's existence and still arrive at the sum of their life.
Likewise, the denial of a specific existence has a similar affect, not to leave that out either.
In specific answer to your exact questions:
Believing or not believeing could affect your decisions, either negatively or positively, but either is likely to have some variation of impact on you, in varying amounts. You might do something great, or something terrible (or something not so much either way).
Without religion, we might still have cars from Japan, but the conditions that they produce them could be drastically different in regards to work practices.






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