Most Christian denominations do not practice open communion, which is irrelevant to a Catholic discussion in any case.

In the late 20th century some, but not all, Christian denominations began to follow the lead of the Episcopal Church and the ELCA in giving open communion, in some cases even to pets!

Of course, this does not detract from the apostolic practice of excommunication, or the scriptural reference provided.

If you were able to provide an occasional cite to something authoritative that “this and other posts which you make here are unreliable as Catholic teaching”, that might go some distance towards dispelling the impression left that one would be as well off seeking religious advice from a Ouija board as from you, particularly when time after time your challenges are met with cold hard citations from authoritative sources and refuted, as in this case.

But you don’t, so the unreliability in matters Catholic appears to be yours alone.