منتدى الفرح المسيحى - The same also applies to men of material beliefs

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By H.H. Pope Shenouda III

Conviction Of The Unseen
The apostle said about faith: "Faith is the substance of things hoped for, the evidence of things not seen" (Heb. 11:1). We want to know what this verse means:
Conviction: is certainty, confidence and belief without doubt. It is not simply an idea, opinion or knowledge gained from reading or hearing about it, but certainty that unseen matters exist.

Here is a clear difference between believers and men of science.

The things that are not seen are not in the working field of the researchers. If they are not sure of something, they investigate it thoroughly with their instruments and apparatus. The same also applies to men of material beliefs.