You got to stop saying that all the church fathers believed this or that when your only source is answers in genesis
He’s sort of right that the Church Fathers believed the earth was young - here’s a list of Fathers and the year they believed earth was created:
Clement of Alexandria (5592 BC)
Sextus Julius Africanus (5501 BC)
Eusebius (5228 BC)
Jerome (5199 BC)
Hippolytus of Rome (5500 BC)
Theophilus of Antioch (5529 BC)
Sulpicius Severus (5469 BC)
Isidore of Seville (5336 BC)
Panodorus of Alexandria (5493 BC)
Maximus the Confessor (5493 BC)
George Syncellus (5492 BC)
Gregory of Tours (5500 BC).
Personally, I believe they were all wrong and simply guessed as best they could given the science of their day. The fact most Fathers believed this, and were dead wrong, doesn’t impact my faith anymore than the fact that the Fathers believed the earth was immobile and the sun revolved around it, or that the human heart was where our thoughts come from, or any of the other pre-Enlightenment pre-Modern ideas which they held and were proven wrong.
The fact that they were wrong about an incidental - the exact age of the earth - doesn’t change the fact they were right about the substantial fact - that God created the earth.