Ask your friend to read Matthew 15:9
"But in vain they do worship me, teaching for doctrines the commandments of men."
Ask: Do you agree that it is wrong to teach and enforce man made commands as if they were God's commands? (that would constitute vain religion)
In terms of medical procedures:
1. Is the command to abstain from vaccinations a doctrine of men or God?
Are you aware that the WTS uniquely outlawed vaccinations during the 1920s and 30s as a violation of God's eternal covenant? (Speculation?) (vanity?) (interpretive abuse – going beyond what is written?) Do you agree that the organization endangered the life and health of its members by issuing this extra-biblical command? Do you believe those who complied by refusing smallpox vaccinations were wise to obey this command of men?
2. Is the command to abstain from organ transplants a doctrine of men or God?
Are you aware that the WTS uniquely outlawed organ transplants as an abhorrent cannibalistic practice during the 1960s and 70s? (Speculation of men?) (vanity?) (interpretive abuse? - going beyond what is written) Do you agree that the organization endangered the life and health of its members by this extra-biblical command? Do you believe those who complied by refusing kidney transplants or cornea transplants were wise to obey this command of men?)
3. Is the command to abstain from blood fractions a doctrine of men or God?
Are you aware that the WTS uniquely outlawed all blood-fractions including fractions 7 and 9 during the 60s? (Speculation?) (vanity?) (unwise?) (interpretive abuse? - going beyond what is written). Do you agree that the organization endangered the life and health of its members by issuing this extra-biblical command? Do you believe those who complied by refusing blood clotting fractions were wise to obey this command of men?
Were those who suffered loss as a result of obeying these unbiblical directives foolish or not?
4. Is the command to abstain from blood plasma a doctrine of men or God?
How did the WTS determine that transfusion of blood plasma was unacceptable, when every one of its componants have been declared acceptable?
P.S. Have documentation ready for support