Numbers are a human construct, just like words in a language. They don't "exist" in the same sense as anything physically real. Nobody has "faith" in the number

Numbers are a human construct, just like words in a language. They don't "exist" in the same sense as anything physically real. Nobody has "faith" in the number one, it's just a concept that's proven to be universally useful. If it weren't useful, people wouldn't (and couldn't) conceptualize it. Again, faith is believing in something despite lack of evidence or despite evidence to the contrary.