Growing up (not in the WT), all I think I knew about JWs is that they went door-to-door two-by-two promoting their religion with a magazine called the Watchtower.
No other details.
Didn't know about the blood issue, holidays, or birthdays.
Didn't even know they professed to be Christians or used the Bible.
Looking back, that ignorance on my part made me that much more vulnerable to their sales presentation.