If the worship community whose service you are attending does “communion” as a remembrance of the Last Supper, not claiming transubstantiation, is it a sin if you knowingly accept/take the matzah & juice?
These links should be helpful for understanding why Catholics should not take communion in a non-Catholic church. If you have any further questions or concerns that are not answered by these links, please [contact Catholic Answers (http://www.catholic.com/home/contact.asp) directly. Recommended Reading:
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