"My child, take care of your father in his old age, do not cause him sorrow as long as he lives.
Even if he has lost his mind, have patience; do not be disrespectful to him while you are in full health. For kindness done to one's father will never be forgotten, it will serve as reparation for your sins." Sirach 3: 12-14
God wants you to love your father, even if your father is severely trying you but iirc, your dad isn't doing this out of spite or hatred so that makes this situation a lot more bearable.
I think the solution to your troubles with your dad might be silence. When Jesus was accused and mocked he stayed silent. When your dad starts another attempt to convert you, stay silent. Try not to argue or defend yourself or get drawn into another argument that will only lead to the same conclusion- just be silent. This is not the ignoring or vindictive silence used as a punishment. Follow the example of Jesus and be silent.