Leviticus does not mention drinking the blood of Christ.
where does it teach drinking the blood of Christ is a sin?
Christians obey the WHOLE Scripture and the NT supercedes the OT.
John 6:53
truly, truly, I say to you, unless you eat the flesh of the son of man and DRINK HIS BLOOD, you have no life in you.
We eat his flesh and drink his blood, spiritually as it is intended...