Okay kiddo, so there are these people called Primitive Baptists who believe in a religion called Christianity. They think that the Bible – which is a book of stories and teachings about God and Jesus – is the only way to know what God wants us to do.
Now, some of these Primitive Baptists are also Universalists. That means they believe that everyone will eventually get to be with God in heaven, no matter what. They think that God's love is so big that it will save everyone, even people who did bad things.
So a Primitive Baptist Universalist is someone who follows the teachings of the Bible and believes in God's love for everyone, no matter what. They believe that we are all part of God's family and that we will all end up in heaven one day.