“All we know is that there is zero evidence it came through Christ or the Apostles.”
Is there any evidence for your ‘cultic origin’? Apparently no evidence >>> evidence.
There is evidence for the communion of saints in terms of the fathers of the church as early as the third century. But unfortunately that doesn’t meet your wholly arbitrary origin just like the doctrine of the trinity doesn’t meet your wholly arbitrary opinion.
“Is there any evidence for your ‘cultic origin’? Apparently no evidence >>> evidence.”
Just the history of the Catholic branch of the Christian Church.
“There is evidence for the communion of saints in terms of the fathers of the church as early as the third century. But unfortunately that doesn’t meet your wholly arbitrary origin just like the doctrine of the trinity doesn’t meet your wholly arbitrary opinion.”
300 years of silence ... And then it becomes a part of practice? Clearly not Christian, which means the origin is outside Christianity. Since cults are fascinated with death, it is the likely source. Whatever the source was - and you do not know - it wasn’t Christian