Tertullian believed that only martyrs go to paradise. All other Christians (the Theotokos being an exception?) have to wait in Hades for the resurrection.
He cites St. Perpetua who, he says, saw ONLY martyrs in Paradise in her vision. He also says that is why in the Book of Revelation, St. John the Evangelist saw ONLY the souls of the martyrs under the Altar and no one else.
Is this part of the reason that he is not considered a saint? Why is he then considered a Church Father?