Pete: Either the individuals writing this material have diminished reading and comprehensive abilities or they are trying to make sure that the message is simple enough for anyone to read and understand.
It's actually not that easy to write clearly and consistently at a specific level of reading ability. This suggests the your second hypothesis. Although I disagree with the "for anyone" piece. This writing suggests a deliberate targeting of people with limited reading ability and/or limited intelligence.
They are clearly NOT interested in appealing to anyone of above average intellect or academic ability. I believe that this is because they are very much aware that anyone in either of those groups just will not be interested in the religion, their belief or false promises.
Those that are stuck in the cult but that are reasonably intelligent are almost always held captive by the thread of being shunned by their entire family and alleged friends.
Let's review: It's a cult!