Tip number 7 (at the link above) for gluten free communion wafers:
7. Once more: contamination is the number one concern. For me, ingesting a product with gluten in it is the same a ingesting something with poison in it. Many others suffer similarly.
So, there it is. It’s bread before it gets to the church. It’s bread when they hand it to you. It’s still bread when you eat it. Not even the glory of god almighty can neutralize the dangers of gluten.