You are a scientist, I believe, and must have heard the same?
No, never. Not even in the context of where we have two or more competing theories, and someone is expressing an opinion on which way they "believe" the matter will be resolved in the future. Phrases such as "I think that..." or "I have a hunch that..." are common in that context, both of which would be immediately challenged with a "why do you think that?" Replies such as "well, I have faith that is the way it will turn out", or "it's just what I believe" would be laughed at, and opinions of said scientist would instantly drop.
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