May a Catholic receive Communion in another denomination church?
This link 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 directly.
*]Ecclesia de Eucharistia (Note especially sections 43-46)
*]May I receive Communion with Lutherans?
*]Why can't Catholics receive Protestant communion?