This is how all Christians did this - until embalming was invented in the USA during our Civil War and cremation became accepted in the 20th Century.... It has much to say for it....
BUT it still has the problem of cemeteries. They take up FAR too much room in urban areas and there is the problem of how long do they need to be maintained. IF we could put 'em in the ground way out in the desert but people want to have cemeteries near them. Throwing the box in the ocean would work for some but most don't live within a few miles of the ocean and then loved ones can't "visit" the grave. Of course, increasingly "cemeteries" are actually buildings (which can be multi storied) and there's no "ground" involved at all but just a niche. But again, maintanance is an issue: how long does this building need to be there?
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The same can be said for Churches - Why waste the real-estate on non-secular enterprises...
Mount Athos has tons of dead monks there - They bury them for three years, dig them out, and place the worm-cleaned bones in the ossuary building with a monk in charge of it who describes them as his "future room-mates"... The American practice is soo unnecessary... $20,000 coffins in cement boxes undereground with a big marker on it for all comers is crackers...
We do, on occassion, make long-term and expensive places of repose for some of the Saints... Whole body relics lie in repose is Churches on occassion, or in cemetaries, and Pilgrims come there to pray and seek answers and helps... But for the most part, we get buried in the ground where our families can remember us...
Honorable burial is a good thing...
Here are two Biblical alternatives:
Jer 22:19
He shall be buried with the burial of an ass,
drawn and cast forth
beyond the gates of Jerusalem.
Mat_26:12
For in that she hath poured this ointment on my body,
she did it for my burial.
Christ was not creamated, nor was even one bone of His broken...
A pine box is a good thing...
Burial in a cemetary in a Monastery is a good thing, for those buried there are remembered daily...
Arsenios