Many of the fathers appear to have taken for granted the "common sense" science of their time. Take for instance the idea that the earth sits unmoving, supported by waters, at the center of the universe, and that the sun revolves around it . You can even find a few examples of Saints and early Christians supporting the idea that the earth is a flat round disk echoing early Jewish thought. You also might come across ideas physical or biological theories that no one would accept now a days too. I don't think being a Saint implies that a person has any special ability to judge such things. That's not what it's about imo. Most of the Fathers just didn't have access to the mountain of scientific evidence we have verifying evolution.
Here is a very small selection of the geocentric, unmoving earth, sun revolving around earth quotes I've seen to use one example:
St Athanasius: but the earth is not supported upon itself, but is set upon the realm of the waters, while this again is kept in its place, being bound fast at the center of the universe. (Against the Heathen, Book I, Part I)
St Athenagoras: to Him is for us to know who stretched out and vaulted the heavens, and fixed the earth in its place like a center (Why the Christians do not Offer Sacrifices, Ch XIII)
ST Basil: There are inquirers into nature who with a great display of words give reasons for the immobility of the earth…It is not, they go on, without reason or by chance that the earth occupies the center of the universe…Do not then be surprised that the world never falls: it occupies the center of the universe, its natural place. By necessity it is obliged to remain in its place, unless a movement contrary to nature should displace it. If there is anything in this system which might appear probable to you, keep your admiration for the source of such perfect order, for the wisdom of God. Grand phenomena do not strike us the less when we have discovered something of their wonderful mechanism. Is it otherwise here? At all events let us prefer the simplicity of faith to the demonstrations of reason. (Nine Homilies on the Hexameron, 10)
St Basil: It will not lead me to give less importance to the creation of the universe, that the servant of God, Moses, is silent as to shapes; he has not said that the earth is a hundred and eighty thousand furlongs in circumference; he has not measured into what extent of air its shadow projects itself whilst the sun revolves around it, nor stated how this shadow, casting itself upon the moon, produces eclipses. (Homilies, IX).