Wrong because that is not what makes the Catholic Church what it is.
The Eucharist is what makes the Catholic Church what it is, along with everything that is listed in the Nicene Creed and the Mass.
You are just plain mistaken about the faith. Consider this excerpt:
***‘Such is the nature of Catholicism that it does not admit of more or less, but must be held as a whole or as a whole rejected’ (Pope Benedict XVI, Ad beatissimi Apostolorum). **
As Father Hahel explains, this means that 'to believe rightly… everything without exception that God teaches us through the Catholic Church, be it written or tradition; be it Holy Writ or not, must be believed. For Christ commissioned His Apostles to teach all nations and to teach them everything that He had told them.
By that He has imposed upon everybody who hears His teachings, the duty to believe all of it. If any one were to reject one simple truth of the faith, though he accepted all others, he would come under the category of those of whom St. James says:
‘now whosoever shall keep the whole law, but offend in one point, is become guilty of all’’(5).
This teaching of the Church is particularly important in our day.
If we reject any of the truths of the Catholic faith - even one - we can no longer call ourselves Catholic. If the acceptance of Vatican II (to which the post-Conciliar conscience is bound) involves a single change in the teaching of the Church Magisterium, this principle applies.
Consider the statement of the Martyr St. Edmund Campion given to the Anglican Bishop Chaney during his ‘trial’:
'What is the use of fighting for many articles of the Faith, and to perish for doubting a few. He believes no one article of the Faith who refuses to believe any single one. In vain do you defend the religion of Catholics,
if you hug only that which you like, and cut off all that seems not right in your eyes. There is but one plain known road: not enclosed by your palings [fences] or mine, not by private judgment, but by the severe laws of humility and obedience.’
As Pope Leo XIII said in his Encyclical Sapaentiae Christianae:
‘To refuse to believe in any one of them is equivalent to rejecting them all’, and as Pius XII taught in his address to the Bishops of the Sacred Congregation in 1949: ‘The Catholic doctrine must be set forth and taught completely and entirely. One cannot allow that anything should be omitted or veiled in ambiguous terms…’*
wandea.org.pl/catholic-faith.html