A person who doesn't believe in God will feel that he is the greatest, and if circumstances permit, he can despise law and morality. And people with faith will have God's laws to bind themselves.
A person who doesn't believe in God will think that money and power are the most important and don't care about moral values. People with faith will understand that money and power can't buy happiness and moral peace.
People who don't believe in God don't think jealousy, rudeness, deception, selfishness and greed are evil, because the law won't condemn them. People who believe in God will understand their duties. They don't always live for themselves, but actually live for God. To live like this is to show the existence and glory of God.
There are many differences.
People with religious beliefs here are people who truly believe in their beliefs, not people who are false and hypocritical. Some people seem to have religious beliefs, but in fact they are doing things that God doesn't like, so they will destroy themselves.