Indeed. But if not a fraud, it must be considered that the devil also does miracles: Even him, whose coming is after the working of Satan with all power and signs and lying wonders, And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie: (2 Thessalonians 2:9-11)
, and the means by which we ascertain the source of such is by the Scripture, which certainly do NOT teach the Cath Eucharist (see post and links above)