I can't think of any good reason against either organ donation or organ use in medical research. Whether we are cremated, or decompose naturally (ie. are consumed by microbes eating our flesh) or are cut up in a science lab, from dust we came and, one way or another, to dust we will return. I don't think any of these will have any effect on the immortal soul of the departed.

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T W Hopper
Member, Presbyterian Reformed Church
Currently between churches since PRC closed here - attending Crossroads Christian Church.
Canberra, Australia.