The Supper doesn’t depend on the faithfulness of the Church. It depends on the faithfulness of Christ.
A rightly-oriented heart and a rightly-oriented love will consistently do what is best for God and best for our neighbor, which is why St. Augustine speaks of sin as a disordered love.
For Bonhoeffer, Christ crucified, and the cross of the Christian life were not of peripheral importance, but foundational.

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To believe God is love and thus loves you is a miracle wrought by the Holy Spirit.
His love for you is so deep that in his mercy, while you were yet a sinner, God sent his only begotten Son to die for you.
“So loved,” then isn’t about how much but instead simply how.
Love is pointing to Jesus who said, “Greater love has no one than this, that someone lay down his life for his friends” (John 15:13).
Let us not recoil at the sight and sound of the crucifixion. It is the battlefield of victory. It is the throne of the King. It is the symbol of salvation.
Christ our Word, as with a two-edged sword, burst the devil's belly.
Authentic proclamation, then, is the love of Christ for our souls, which we have seen and experienced through the under-shepherd’s pastoral care put into the words of Christ Himself.
The sign of the cross, according to the earliest centuries of Christians, is “the sign of the Lord,” and every baptized Christian was “marked” with it.
The sermon takes place in the context of a multi-facetted set of relationships experienced through the weeks and months of being together in congregation and community. Those relationships shape the credibility of the preacher in the pulpit. 
As the writer to the Hebrews affirms, what makes the Christian gospel so much better is that we are no longer dealing with “types and shadows."
That great truth of creedal Christianity – that God is man in Christ – is not set forth for our speculative enjoyment.
Despite our best efforts to avoid him, King Jesus remains very much unavoidable.