The OT says it's about faith.
Jesus says it's by faith
The Gospel writers say it's by faith.
Paul said it's by faith.
Peter says it's by faith.
Catholcism says you have to eat and drink flesh and blood which in violation of the OT laws.
Ummmmm. Wonder who I'm going with on this one.
How about having faith in the One who told us....no, ordered us to eat of His Flesh and drink of His blood. And in case you hadn't noticed, the OT is over and done.