Can non-Catholic Christians receive communion in the Catholic Church?
Catholic Answers Senior Apologist Jimmy Akin explains why non-Catholics can only receive the Eucharist under very limited extra-ordinary circumstances.
Jimmy Akin was born in Texas and grew up nominally Protestant. At age 20 he experienced a profound conversion to Christ. Planning on becoming a Protestant pastor or seminary professor, Jimmy started an intensive study of the Bible, but the more he immersed himself in Scripture, the more he found...
"Who does not see that knowledge precedes faith? Nobody believes unless he knows what to believe."
~ Augustine of Hippo, convert, bishop, theologian, Father and Doctor of the Church, Saint; noting that the assent of faith is a rational act; before it can be made, it must be known for certain that there is a God, that He has spoken, and that what He has spoken is known. (see "Science and the Church")