Blood transfusions are a common and often lifesaving procedure. However, some groups, such as Jehovah’s Witnesses, forbid blood transfusions on religious grounds.
I find the wording in the opening sentence problematic.
"However, some groups, such as the Jehovah's Witnesses..." gives the impression that there are more groups than just the Jehovah's Witnesses that forbid blood transfusions.
There isn't. I have yet to find any other group except the Jehovah's Witnesses that forbids blood transfusions.
The Jehovah's Witnesses are the ONLY religious group that forbids blood transfusions.
This opening sentence misleads the reader right from the start by implying that the JWs are just one of others who also follow the same practice. There are no others.
What the medical world does grapple with, however, is the spill over effect of the WT anti-blood propaganda. They refer to " people who refuse blood transfusions for reasons unrelated to religion". This group includes all the exJWs who cannot shake the anti-blood indoctrination they have been exposed to by the WT.
"Reasons unrelated to religion" means that lots of those people have believed the pseudo-science that the WT has spread about the dangers of blood transfusions. The WT is responsible for instilling a blood phobia in their followers and that phobia has spread like a virus into the medical community and into the patient community at large.