The Catholic belief in The Real Presence of Jesus in the Eucharist is a hard saying, no doubt.  Yet, it's no harder a saying as was said by Jesus himself as he begins his colloquy with his disciples in the synagogue at Capernaum (see Jn 6:30). This teaching, the Catholic Church defends as the definitive and apostolic origins of the Eucharist, points to the Eucharist (from the Greek for "thanksgiving") as the "source and summit of the Christian life". For a beautiful summation of the scandal of such a saying - and the recognition of how hard it is to believe - enjoy this brief writing from Fr. Richard Veras of Saint Joseph's Seminary; and for a Catholic answer addressing common Evangelical Fundamentalist challenges to the Catholic understanding of the Real Presence, please also see more of this post by clicking on the image. Peace be with you!