Well, sweetie, Cultural Christians are people who come from a Christian cultural background or tradition, but they may not necessarily practice their religion (Christianity) or believe in it completely.
You know how people sometimes celebrate Christmas even if they aren't Christian? Or they might say "Oh my God" or "Bless you" when someone sneezes without necessarily believing in God? That's kinda like being a Cultural Christian.
It's like they still carry the traditions, values, and beliefs of their Christian culture with them, but they may not have a strong connection to the religious part of it. It's like an identity thing, sort of like saying "I'm Italian" even if you were born and raised in a different country.
Some people might just go to church on holidays, or they might say they pray, but they don't really follow all the rules of Christianity or read the Bible regularly.
Does that clear things up, honey?