1 Corinthians 10:3 And did all eat the same spiritual meat; 4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
Paul posed two questions in 1 Corinthians 10 that can be answered yes or no. Christians answer yes, you appear to answer no since you are emphasizing “spiritual”.
Paul does not say the cup of blessing we bless is a SPIRITUAL sharing in the blood of Christ. he could have, but he did not, beacuse it is not spiritual.
Christians have believed Paul for 2,000 years.’
non-Christians, not so much.
So what's your point, or do you thing just haphazardly quoting verses that contain "eat and drink" will help your argument?