Sorry, I thought my point was clear.
As a Catholic, you can come to my church and partake in Communion any time you want.
I couldn't do the same in your church then, or now.
Sinkspur doesn't mind praying at the feet of Christ beside anyone -- pagan, democrat, Osama bin Laden. In fact, he and the Pope welcome them!
But neither Sinkspur, the Pope nor you, apparently, want fellow Christians like RnMom, GWB or me to share in Communion with you.
My other point was that that priest had a pretty good sense of humor.
We very much want that. But, while to you, a Christian praying at the same event at which a Muslim prays implies agreement that the Muslim offers true worship to the true God, to us, the sharing of communion implies a unity of belief. That would include, for example, a unity with us on what, exactly, communion is. Do you have such a unity of belief with us? If you do, you should become Catholic. If you don't, then communion clearly doesn't mean to you what it means to us.
Please note that I think how, or whether, the LCMS disciplines Rev. Benke is their own business, so I'm not taking any side in that discussion. Nor, in general, do I approve of Catholic participation in "interfaith services" as a matter of prudence, except with the Eastern Orthodox. For example, were I in Cardinal Egan's shoes, I would not wish to participate in an "interfaith service" with a clergyman representing a denomination which officially teaches that the Pope is the antichrist, as the LCMS does.