This is not a comprehensive list. These questions are only from scriptures and wt. You could also bring up medical facts and the risks of transfusions.
WT summary:
1. The whole blood doctrine is based first on the use of Genesis 9:5 where God told Noah to poor out blood and give it back to Him. It can't be eaten! This means that blood is sacred.
2. Next there is in Leviticus I think, a section about pouring blood on the altar. It can't be eaten! This means blood is only to be used for sacrifice.
3. Finally in Acts there is a couple of verses that say "abstain from blood". This means abstain completely, totally, and entirely!!!
Some good setup questions:
If you are reading a verse, you are often able to come up with several different meanings right? I mean abstain from blood wasn't likely referring to blood transfusions because they weren't taking place at that time. So that means we have to take that verse and apply it to mean it includes blood transfusions, right?
So when we take a verse and try to find it's meaning in our lives, should we pick the most likely, or the one that is most difficult for us?
For 1 and 2 you could simply say:
"BUt in those verses, isn't it talking about something that died. I mean isn't that why blood is sacred because it represents the life lost? Isn't that the same reason blood is used for sacrifice? I mean there is nothing magical about blood, it is a symbol of the life lost right?"
"Isn't saying you should be willing to die rather than be disrespectful to the symbol of life (blood), kind of like saying I will sacrifice my marriage to save my wedding ring?"
"As a rule, isn't it a good thing to be REALLY difficult to convince that God wants you to let your kids die?"
For 3 you could say:
"How do you abstain from an object? I mean don't you abstain in the form of an action? I mean if I say I abstain from junkfood, you know that I mean I abstain from EATING junkfood. It is obviously implied. So if that verse says abstain from blood, doesn't that mean the writer didn't put the specific action in their, because it is so obviously implied? So the question is what action in regards to blood was so obviously taking place that the writer didn't see the need to say it explicitly? Was it blood tranfusions?"
THey will probably say:
If a doctor told you to abstain from alcohol, would you think it was ok to inject it into your viens?
Respond:
Well if it was my family practioner I would say yes, but then if it was my dermatologist I would figure he was telling me not to use products with alcohol on my skin. See context matters here.
Eventually he will get flustered and rely on the credibility of the org and God's arrangement:
At this point you have them. First ask:
"So the WT says that is what those verses mean? But didn't they used to say it was wrong to have an organ transplant or vaccinations? So did God tell them to make those mistakes? Or did they make a mistake, in which case doesn't that mean they can't be trusted to interpret the blood verses correclty? " (point them to reexamine.org)
"Does God expect you to obey the org, at the risk of your own life, when they are wrong?"
Then they will say they have to obey Jehovah's organization:
Now you really got 'em
"Well when Jesus showed up, God's organization wanted to kill him. Judas obeyed God's organization and betrayed Jesus, instead of following his conscience. Judas wasn't rewarded. He was reviled and judged!"
CYP