Was the thief on the cross baptized?
The eucharist is the NT sacrificial covenant meal as in
Ex 12:3-11, where they ate the flesh of the lamb that was slain,
Ex 24:4-11, where they feast on the (fellowship) offering itself (v.5) in the presence of God (v.11 cf Dt 27:7),
Lev 3:1-17, 7:14-21, 19:5-8, where the flesh of the sacrifice was eaten in a fellowship/communion meal,
Mt 26:26-28, the Lord's Supper, where bread was given as the flesh of the sacrifice.
The church is the body of Christ (Eph 5:29-32), made up of all those who are born-again (Jn 3:3-5), who enter only by the new birth/salvation.
The church is the body of the already redeemed, of the already saved.
Salvation places one in the church.
Therefore, your questions is: Is salvation (which places one in the body of Christ, the church) necessary for salvation?