the Lord's supper is nowhere referred to as spiritual food anywhere interpretive of John 6 (Acts thru Rev.), instead, the word of God is what is taught as being spiritual nourishment, being that which is called "milk" and "meat" (1Co. 3:2; Heb. 5:13; 1Pt. 2:2) by which believers are "nourished" (1Tim. 4:6) and built up, and with the preaching of which being the primary active function of pastors, whereby they "fed the flock." (Acts 20:28, 32) Thanks be to God
Moreover, since you invoked "Except you eat the flesh of the Son of man, and drink his blood, you shall not have life in you" [Jn. 6:53] then since one obtains spiritual life within via regeneration by the Spirit of Christ (Jn. 3:7; Gal. 4:6) then you must show where souls ever obtained this spiritual life-giving regeneration by taking part in the Lord's supper, versus believing the gospel.
Such as,
There was a certain man in Cæsarea called Cornelius, a centurion of the band called the Italian band, (Acts 10:1) And he shewed us how he had seen an angel in his house, which stood and said unto him, Send men to Joppa, and call for Simon, whose surname is Peter; Who shall tell thee words, whereby thou and all thy house shall be saved. (Acts 11:13-14) Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:... (Acts 10:34)
To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins. While Peter yet spake these words, the Holy Ghost fell on all them which heard the word. And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. For they heard them speak with tongues, and magnify God. Then answered Peter, Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we? And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days. (Acts 10:43-48)
And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe. And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us; And put no difference between us and them, purifying their hearts by faith. (Acts 15:7-9)
Of his own will begat he us with the word of truth, that we should be a kind of firstfruits of his creatures. (James 1:18)
In whom you also, after you had heard the word of truth (the gospel of your salvation), in whom also believing, you were signed with the holy Spirit of promise. (Eph 1:13 [DRB])
In contrast, the Lord's supper is only for the already regenerated, in which they effectually remember the Lord's death by showing/proclaiming (1 Corinthians 11:26) the communal unity with Christ and members of His body which were bought with His sinless shed blood, (cf. Acts 20:28) by taking part in a holy communal meal, as together being "one bread." (1 Corinthians 10:17)
Likewise, to take part in dedicatory pagan religious feasts is to have "fellowship with devils." (1 Corinthians 10:21)
See 1 Co. 10,11 , by the grace of God.
CREDO