In that case it would be a fallacy to incorporate faith into the line of reasoning. Yeah you can do it, it is illogical to do so. If you use faith as any of your premises in an argument, the conclusion cannot be held as true.
It may be an invalid argument, but it could be true anyway. It would not be a logically wrong argument, just an argument that does not prove anything.
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your 7 time champion, Link.