Imagine that you have two very best friends who are in two different groups. One group likes to play dress up and have tea parties, while the other likes to play soccer and climb trees. You really like both things, so you want to be friends with both groups.
This is kind of like what double belonging means. It's when someone belongs to more than one group, and those groups might have different beliefs or practices.
For example, maybe you go to church on Sundays and your family believes in God. But then you also go to a school where none of your friends go to church and they don't believe in God. You might feel like you belong to both groups, even though they have different ideas about religion.
Double belonging can be tricky because sometimes the groups might not get along or understand each other. But as long as you feel comfortable and happy in both groups, it's okay to belong to both! You can enjoy the tea parties and the soccer games, and you can believe in God and not believe in God, too.