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No serious and faithful Protestant or Muslim would do that, and no serious and faithful Catholic bishop would allow them. It’s a matter of personal integrity and mutual respect, which are lacking here. The Eucharist is not a warm, fuzzy game. If anyone should know that, it would be the bishop.

A Muslim, almost certainly not. A Protestant? Why would he care, they don't believe in the Eucharist, it's just a cracker and some grape juice. Receiving Communion means very little to him.

The Bishop shouldn't allow them, but does the Bishop even know who they were? Bishops don't offer Masses to a congregation that often, so it's not like your local priest who recognizes the couple hundred people he sees every week. A Bishop might offer a Mass at a particular congregation once or twice a year. He'll likely recognize almost no one besides the diocese priests and his staff. And Catholics don't pull a background check every time someone presents for Communion, so unless the Bishop knew or had reason to believe these guys weren't Catholic, there's no reason he would deny them Communion. And, the German Bishops are generally excessively liberal, so they likely wouldn't care anyway. They'd probably like/come up with the idea, to promote "inter-faith dialogue"...