So, imagine that you're just a regular Joe who's not familiar with the Witnesses and is looking for the answers to life, the universe, and everything. You hear a knock at your door. Before long, you are studying with a Jehovah's Witness. There's lots of clear-cut answers to your questions, straight from the Bible. Sure, some teachings are a bit odd, like this "earthly/heavenly hope" business, but everything has a scripture as its basis, so the study is moving along.
You come to the chapter in the study book that mentions blood transfusions and how they're not allowed. You're concerned about this, but your study conductor reassures you, "Certain fractions are a conscience matter, so you can at least take those if you want." You say, "Really? I can take fractions of this sacred substance, just not the major components? What are the scriptures that say a fraction of something forbidden is okay?" The Witness shrugs. "Can I at least see a list of what I can take?" The JW supplies you with a complicated list.
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What is going through your mind at this point? Isn't just about anyone's BS Alarm liable to be going off at this point?
In the old days, the teaching was very simple: The OT says not to eat blood, and the NT maintains the command to abstain from blood, therefore we don't take any blood into our system. If you weren't inclined to look deeper into what those verses are actually saying, this seemed quite satisfactory. "Hey, I guess these people are just following the Bible more faithfully than anyone else."
That's not to say that there haven't always been Bible students who balked, and ultimately stopped studying, because of this teaching. But I have to think that the teaching is actually making the religion harder to take credibly now that many fractions are allowed. It's just so arbitrary that it seems insane.
We've noticed that it's becoming nearly impossible to find anyone in the first world to convert to the religion if they weren't raised in it. I can't help but wonder if this convoluted fractions business plays any role in that. Eh, maybe not. I would imagine a bunch of other teachings are bigger stumbling blocks for most students, like no holidays, or 1914, etc. I guess I'm just wondering if anyone here has personal experience with this, if they conducted a Bible study after fractions were allowed, and discussed it with the student.