I know that a lot of us have been told that the cause of our allergy problems is reflux or GERD and that the allergies are a symptom of the GERD.
I think you're misunderstanding the connection and the issue. There is absolutely no evidence that allergies and GERD are connected. Allergies are a well-documented overreaction of the immune system to a foreign substance that has nothing to do with acid reflux.
There is a clear connection between GERD and chronic sinus issues/ asthma-like symptoms that are non-allergic.
Although researchers haven't identified the specific mechanism that connects the two, it's clear that acid reflux can cause irritation and inflammation in the bronchi and, in some cases, far up into the upper respiratory tract. This inflammation causes asthma-like symptoms and can be a contributing factor for chronic sinusitis.
GERD and allergies can have some common symptoms, particularly post-nasal drip (caused by the allergic reaction for allergy sufferers or by the body's increased production of mucus to help heal damaged areas in the esophagus for GERD sufferers), which may also be part of the confusion.