[stranger and pilgrim]

Natural communion is merely a visible for the spiritual communion that feeds the soul — taking in God’s word (bread) and spirit (wine). If you do the spiritual, the natural doesn’t really matter.

But, that said, if a Catholic BELIEVES it is a sin to take communion at a non-Catholic church, it is:

“whatsoever is not of faith is sin.”

[Mrs. Don-o]

"If you do the spiritual, the natural doesn’t really matter."

Thanks for this, it gives a good insight into why you believe as you do.

Catholics would clearly differ with you on this. We think the natural matters. It is an axiom of Catholic sacramental theology that "Matter matters."