Just be aware that if the religious beliefs are made to sound like a fairy tale to them--and especially the way a lot of people who are inexperienced with GT kids speak down to kids, this can happen--the child will be learning to mistrust you. Adult religious beliefs tend to be nuanced and complex, but kids are often given a version of those beliefs that is "Disney-ized." That sanitized, cartoon-like version may not work for a GT kid.
Honesty, tempered by an understanding of your child's needs and emotional maturity, is always the best policy. So if you ask someone at the church to speak to your child, please make sure they understand your child and that they're serving the child's needs rather than spooning out oversimplified "kiddie" pap. I think that can really do more harm than good.
A good "No one knows for sure, but this is what we believe" is always a good idea, too, I think. It's honest, reassuring, stresses the family's values appropriately, and explains why our answers aren't always the greatest when it comes to this topic.
