But in fact, Newman had lectured in more detail on the topic before, and here is a lengthy selection, worth reading in full, from the closing paragraphs of Lecture 7 in his Idea of a University:
And now we come to the case of Physical Theology, which is directly before us. I confess, in spite of whatever may be said in its favour, I have ever viewed it with the greatest suspicion. As one class of thinkers has substituted what is called a Scriptural Religion, and another a Patristical or Primitive Religion, for the theological teaching of Catholicism, so a Physical Religion or Theology is the very gospel of many persons of the Physical School, and therefore, true as it may be in itself, still under the circumstances is a false gospel. Half of the truth is a falsehood:—consider, Gentlemen, what this so-called Theology teaches, and then say whether what I have asserted is extravagant.
Any one divine attribute of course virtually includes all; still if a preacher always insisted on the Divine Justice, he would practically be obscuring the Divine Mercy, and if he insisted only on the incommunicableness and distance from the creature of the Uncreated Essence, he would tend to throw into the shade the doctrine of a Particular Providence. Observe, then, Gentlemen, that Physical Theology teaches three Divine Attributes, I may say, exclusively; and of these, most of Power, and least of Goodness.
And in the next place, what, on the contrary, are those special Attributes, which are the immediate correlatives of religious sentiment? Sanctity, omniscience, justice, mercy, faithfulness. What does Physical Theology, what does the Argument from Design, what do fine disquisitions about final causes, teach us, except very indirectly, faintly, enigmatically, of these transcendently important, these essential portions of the idea of Religion? Religion is more than Theology; it is something relative to us; and it includes our relation towards the Object of it. What does Physical Theology tell us of duty and conscience? of a particular providence? and, coming at length to Christianity, what does it teach us even of the four last things, death, judgment, heaven, and hell, the mere elements of Christianity? It cannot tell us anything of Christianity at all.
Gentlemen, let me press this point upon your earnest attention. I say Physical Theology cannot, from the nature of the case, tell us one word about Christianity proper; it cannot be Christian, in any true sense, at all:—and from this plain reason, because it is derived from informations which existed just as they are now, before man was created, and Adam fell. How can that be a real substantive Theology, though it takes the name, which is but an abstraction, a particular aspect of the whole truth, and is dumb almost as regards the moral attributes of the Creator, and utterly so as regards the evangelical?
Nay, more than this; I do not hesitate to say that, taking men as they are, this so-called science tends, if it occupies the mind, to dispose it against Christianity. And for this plain reason, because it speaks only of laws; and cannot contemplate their suspension, that is, miracles, which are of the essence of the idea of a Revelation. Thus, the God of Physical Theology may very easily become a mere idol; for He comes to the inductive mind in the medium of fixed appointments, so excellent, so skilful, so beneficent, that, when it has for a long time gazed upon them, it will think them too beautiful to be broken, and will at length so contract its notion of Him as to conclude that He never could have the heart (if I may dare use such a term) to undo or mar His own work; and this conclusion will be the first step towards its degrading its idea of God a second time, and identifying Him with His works. Indeed, a Being of Power, Wisdom, and Goodness, and nothing else, is not very different from the God of the Pantheist.
In thus speaking of the Theology of the modern Physical School, I have said but a few words on a large subject; yet, though few words, I trust they are clear enough not to hazard the risk of being taken in a sense which I do not intend. Graft the science, if it is so to be called, on Theology proper, and it will be in its right place, and will be a religious science. Then it will illustrate the awful, incomprehensible, adorable Fertility of the Divine Omnipotence; it will serve to prove the real miraculousness of the Revelation in its various parts, by impressing on the mind vividly what are the laws of nature, and how immutable they are in their own order; and it will in other ways subserve theological truth. Separate it from the supernatural teaching, and make it stand on its own base, and (though of course it is better for the individual philosopher himself), yet, as regards his influence on the world and the interests of Religion, I really doubt whether I should not prefer that he should be an Atheist at once than such a naturalistic, pantheistic religionist. His profession of Theology deceives others, perhaps deceives himself.
Do not for an instant suppose, Gentlemen, that I would identify the great mind of Bacon with so serious a delusion: he has expressly warned us against it; but I cannot deny that many of his school have from time to time in this way turned physical research against Christianity.