Faith itself is not a measure of irrationality. Faith is an often useful heuristic tool to avoid psychological paralysis in the face of inadequate information or evidence about the relative merits of an array of alternative paths that can be taken.
Faith only becomes an manifestation of irrationality when it is used to support an alternative in defiance of weight of evidence and available information.
Faith only becomes an manifestation of irrationality when it is used to support an alternative in defiance of weight of evidence and available information.