The one and only altar that Christ sacrifice could be offered on is in heaven and no where does Scripture say he is offered or present in a wafer and wine to be offered on an earthly altar. Quite the contrary
it’s a shame those Christians in the catacombs didn’t realize this, they wouldn’t have had to risk their lives by having “altars” in their worship service.
Anything done in a catacomb has to absolutely correct? I didn’t know.....