Critical Examination of the Life of St. Paul

Sir, In our last conversation you appeared to me, very much smitten with St. Paul and his works; you recommended me to reperuse his writings; assuring me that I should there find arguments well calculated to shake incredulity and confirm a Christian in his faith.
Although the actions of this celebrated Apostle, related in the Acts, and his doctrine contained in his Epistles, were already perfectly known to me, yet to conform myself to your desires, and give you proofs of my docility, I have again read those works, and I can assure you that I have done it with the greatest attention. You will judge of that yourself, by the reflections I send you; they will at least prove to you that I have read with attention. A superficial glance is only likely to deceive us or leave us in error. The passions and the prejudices of men prevent them from examining with candour, and from their indolence they are often disgusted with the researches necessary for discovering truth; that has also been with so much care veiled from their eyes: but it is in vain to cover it, its splendour will sooner or later shine forth; the works of enthusiasm or imposture, will always end by betraying themselves. As for the rest, read and judge. You will find, I think, at least, some reasons for abating a little from that high opinion, that prejudice gives us of the Apostle of the Gentiles, and of the religious system of the Christians, of which St. Paul was evidently the true architect. I am not ignorant that it is very difficult to undo at one blow the ideas to which the mind has been so long accustomed; but whatever may be your judgment it will not alter the sentiments of friendship and attachment which are due to the goodness of your heart.
I am, &c, &c.
Many theologians would make us regard the miraculous conversion and apostleship of St. Paul as one of the strongest proofs of the truth of Christianity. But in viewing the thing closely it appears that this conversion, far from proving any thing in favour of this religion, invalidates the other proofs of it, in fact, our doctors continually assure us that the Christian religion draws its strongest proofs from the prophecies of the Old Testament, whilst there is not in fact a single one of these prophecies that can be literally applied to the Messiah of the Christians. St. Paul himself willing to make use of these oracles of the Jewish nation to prove the mission of Christ, is obliged to distort them, and to seek in them a mystical, allegorical, and figurative sense. On the other side, how can these prophecies made by Jews and addressed to Jews, serve as proofs of the doctrine of St. Paul, who had evidently formed the design of altering, or even of destroying, the Jewish religion, in order to raise a new system on its ruins? Such being the state of things, what real connection, or what relation, can there be between the religious system of the Jews, and that of St. Paul? For this Apostle to have had the right of making use of the Jewish prophecies, it would have been necessary that he should have remained a Jew; his conversion to Christianity evidently deprived him of the privilege of serving himself, by having recourse to the prophecies belonging to a religion that he had just abandoned, and the ruin of which he meditated. True prophecies can only be found in a divine religion, and a religion truly divine, can neither be altered, reformed, nor destroyed: God himself, if he is immutable, could not change it.