The opposite of faith is works

But faith without works is dead (James 2:20). How confusing!

That's why it's hard to tell whether someone has faith or not just by observing their outward performance. Some people (religious and irreligious) work very hard because they are self-reliant, striving to justify their worthiness by what they do. In contrast, others work very hard because their faith in God empowers them to dream big, then strive to see those dreams become reality.

On the outside, the faithful and the faithless can both look the same. Though I'd bet that the faithful sleep better at night than their self-reliant counterparts.