Most Church Fathers probably didn't even know that they existed... well, maybe Zoroaster and Buddha to a limited degree. And as Romaios said, these quotes probably shouldn't be read for themselves.Dionysii said:They did not take from them as if they needed to learn truths from them.Ansgar said:did not the Church Fathers take from the ancient greek philosophers, that which was true and good?
Some Church Fathers did indeed quote specific doctrines which were true in order for their audience to identify with a part of their teaching.
However, I am unfamiliar with any Church Fathers glorifying the memory or either Zoroaster, Lao Tse, Buddha, or Krishna.
The Church Fathers did the opposite of the Nikonian Bishop Nikolai Velimirovich.