I think (though please correct me if I’m incorrectly extrapolating) polls tend to show that** a solid majority of Catholics** do not believe in the Real Presence. Just as an empirical matter, the presence or absence of the ‘Real Presence’ isn’t going to be the thing that prevents most Catholics for leaving or staying.
Are there Catholics who don’t believe? Sure
Keep in mind, even when Jesus taught His disciples face to face, about Himself and what they are to believe, many didn’t believe Him and walked away from Him.
Jn 6: (all emphasis mine)
40 For this is the will of my Father, that every one who sees the Son and believes in him should have eternal life; and I will raise him up at the last day.” 41 The Jews then murmured at him, because he said, “I am the bread which came down from heaven.” 42 They said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How does he now say, ‘I have come down from heaven’?” 43 Jesus answered them, “Do not murmur among yourselves. 44 No one can come to me unless the Father who sent me draws him; and I will raise him up at the last day. 45 It is written in the prophets, ‘And they shall all be taught by God.’ Every one who has heard and learned from the Father comes to me. 46 Not that any one has seen the Father except him who is from God; he has seen the Father. 47 Truly, truly, I say to you, he who believes has eternal life. 48 I am the bread of life. 49 Your fathers ate the manna in the wilderness, and they died. 50 This is the bread which comes down from heaven, that a man may eat of it and not die. 51 I am the living bread
c] which came down from heaven; if any one eats of this bread, he will live for ever; and the bread which I shall give for the life of the world is my flesh.”
52 The Jews then disputed among themselves, saying, “How can this man give us his flesh to eat?”
d] 53 So Jesus said to them, “Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you; 54 he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. 55 For my flesh is food indeed, and my blood is drink indeed. 56 He who eats my flesh and drinks my blood abides in me, and I in him. 57 As the living Father sent me, and I live because of the Father, so he who eats me will live because of me. 58 This is the bread which came down from heaven, not such as the fathers ate and died; he who eats this bread will live for ever.” 59 This he said in the synagogue, as he taught at Caper′na-um.
60Many of his disciples, when they heard it, said, “This is a hard saying; who can listen to it?” 61 But Jesus, knowing in himself that his disciples murmured at it, said to them, “Do you take offense at this? 62 Then what if you were to see the Son of man ascending where he was before?
e] 63 It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and life. 64
But there are some of you that do not believe.” For Jesus knew from the first who those were that did not believe, and who it was that should betray him. 65 And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”
66
After this many of his disciples drew back and no longer went about with him.
Bottom line,
- some/many followers won’t believe even if God Himself in the flesh, is teaching them face to face.
- there are Judases as well who are among the members.
Haven’t we heard it many times, it doesn’t matter what a person “says” they are or “calls” them self that counts, it’s what they
do and how they live that determines who they are and what they believe.