It is a Christian value to share one's life with his brothers and sisters in faith. Donating of organs, is that acceptable? You do not donate, the Bible asks you to give.
1 John 3:16–
"Hereby perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren."
If you are kind enough to a brother that needs kidney, why can you not give one? Giving a part of us is not against God’s law, so that a brother may live, we can give even our lives.
Romans 16:3–
"Greet Priscilla and Aquila my helpers in
Christ Jesus"
Romans 16:4–
"Who have for my life laid down their own necks: unto whom not only I give thanks, but also all the churches of the Gentiles."
It is allowed by the love that God had taught us in the Bible. If the Jehovah witness prohibit donating a little of your blood to somebody in need of it, it is a stupid doctrine because we are commanded by God to lay down our lives for the sake of the brethren.
If our life can be given, our neck can be offered to be cut for the sake of a person, like the Apostle Paul which the couple Priscilla and Aquila did, why cannot we give a part of our body for the sake of love that God has taught us? I do not believe it is evil to donate organs.
Thank you very much for your continuous support 🙏