IF you can have a conversation about Romans 6, I find that the best line of reasoning is this:
If our sins are acquitted at physical death, then every person, every... single... person..., up to this moment in time that has died is acquitted of their sins. That means that the blood of the Christ has NO EFFECT on ANYONE that has died in the past. Not the apostles. Not the disciples. Not faithful Israelites that died. Not faithful Christians since then, but ONLY operates toward those CURRENTLY living.
Obviously, this makes no sense. It does not square with what Paul wrote eariler in Romans:
God presented him as an offering for propitiation through faith in his blood. This was to demonstrate his own righteousness, because God in his forbearance was forgiving the sins that occurred in the past. - Rom. 3:25
It stands to reason that people who died before Christ came along did NOT have their sins acquitted at death, otherwise, there would be NO NEED for forgiveness of those sins. Thus, the understanding that the Society has CANNOT be correct.
This point was actually driven home to me by a very humble person I met in the field ministry one day. She said, basically, 'If our sins are acquitted at death, then why in the world did Christ die for us to begin with?'