Some basic human historical facts too many people are ignorant about

In case one day your child comes back home and asks you "Are our gods and goddesses Fake? My friend said so". 

You can reply: 

1. Our gods and goddesses symbolize a way of living and it belongs to an ancient "religion", if you'd like to call it that way, in fact, the only surviving ancient religion. A way of living so to accept and respect the Unknown, and any expression on the path of searching is tolerated and respected based on our way of living, anyways. Thus when "our gods and goddesses" already existed for thousands of years, your friend's "one true male god" was just written into books. 

2. Just so you know, all the ancient religions, like ours, Mayan, Egyptian, Assyrian, Greek, Persian, and ancient Chinese etc, all of them had equally powerful Goddesses that ancient people worship, like how we still worship goddesses today. It was only later that society was more divided, and gradually men became more powerful, thus in the young religions that were less than 2000 somewhat years old, only male presence got written into books as the divine or main deity. In the young religions, women only exist as secondary, attachment, sin or property. You should be so proud that we still celebrate Goddesses today, like how ancient people did thousands of years ago. 

3. Tell your friend America is a democratic country, religious freedom is each and every citizen's fundamental right, and also is each and every citizen's duty to protect. What your friends learn in the church is his/her freedom, but running around outside and making comments that violate religious freedom is different. They should know the line.