I have never heard a Catholic say they believe in the real presence because of a feeling they get when they take the Eucharist. I suppose it’s possible, but I have never been taught, nor have I read, nor have I ever heard that “feeling” the presence of Christ is a reason to believe in the real presence in the Eucharist. I believe in it because Christ taught this doctrine himself. It was also taught by the apostles and by the universal church from the very beginning. I take Christ’s word for it. I don’t need a feeling to confirm it.
This is entirely different from Mormons, who are taught all their lives to rely on feelings to confirm their beliefs. It is a very unreliable method to find truth, especially when trying to confirm specific things. Our feelings are subject to so many influences that they cannot be relied upon as a sole reason for belief in a particular doctrine. From LDS historian Grant Palmer’s book An Insider’s View of Mormon Origins about this subject:
Most of us have have felt this spiritual feeling when reading the Book of Mormon…What we interpret this to mean is that we have therefore encountered the truth, and then we base subsequent religious commitments on these feelings. The question I will pose is whether this is an unfailing guide to truth. Is something true because I and others find it edifying? Hundreds of thousands of people believe in the truthfulness of their own religion because of similar confirming experiences. As one example, many people, including myself, felt this confirming spirit when we heard the World War II stories of Utah Congressman Douglas R. Stringfellow. Stringfellow’s experiences were later revealed to be a complete hoax. I was about fourteen years old when I heard him speak, and it was a truly inspiring experience. After Stringfellow concluded, I remember that the leader conducting the meeting said, “If you have never felt the Spirit before, it was here today in abundance.” He was right. I felt it strongly, as did many others. More recently, I felt the same spirit, along with many others, when hearing Paul H. Dung, a member of the First Quorum of the Seventy, relate his religious experiences during World War II and as a professional baseball player. Today his stories are known to be contrived.
Certain religious experiences can stir up strong feelings within our hearts, but they clearly should not be used as the primary method of discerning whether or not something is true. Allowing yourself to be convinced in this way sets you up for deception, as shown in the examples above.