He was also known to be openly scornful of many of the tenets of Christianity and held in contempt most leaders of the Christian church. Look into it sometime. You might be surprised what you find.
It would be interesting to have that quote, in its context. As I've said, Jefferson's philosophy and theology were largely consistent with Deism, but from what I've seen, he had a great affinity (of his own interpretation) for Christ and did not choose to call himself by the label "Deist," preferring to position himself and act according to his interpretation of how Christ acted (i.e., independently).
To Dr. Benjamin Rush - Monticello, Sep. 23, 1800 - 1800092
I promised you a letter on Christianity, which I have not forgotten. On the contrary, it is because I have reflected on it, that I find much more time necessary for it than I can at present dispose of. I have a view of the subject which ought to displease neither the rational Christian nor Deists, and would reconcile many to a character they have too hastily rejected. do not know that it would reconcile the genus irritabile vatum who are all in arms against me. Their hostility is on too interesting ground to be softened. The delusion into which the X. Y. Z. plot shewed it possible to push the people; the successful experiment made under the prevalence of that delusion on the clause of the constitution, which, while it secured the freedom of the press, covered also the freedom of religion, had given to the clergy a very favorite hope of obtaining an establishment of a particular form of Christianity thro' the U. S.; and as every sect believes its own form the true one, every one perhaps hoped for his own, but especially the Episcopalians & Congregationalists. The returning good sense of our country threatens abortion to their hopes, & they believe that any portion of power confided to me, will be exerted in opposition to their schemes. And they believe rightly; for I have sworn upon the altar of god, eternal hostility against every form of tyranny over the mind of man. But this is all they have to fear from me: & enough too in their opinion, & this is the cause of their printing lying pamphlets against me, forging conversations for me with Mazzei, Bishop Madison, &c., which are absolute falsehoods without a circumstance of truth to rest on; falsehoods, too, of which I acquit Mazzei & Bishop Madison, for they are men of truth.
And here is another quote, where Jefferson posits that his views are strictly personal in nature. As in other places, he vaguely alludes to himself being oriented in the neighborhood of Christianity, while preferring not to admit to any creed. Interestingly enough, he also speaks of Deism as an identity that can't be pinned on him, so to speak.
To Mrs. Samuel H. Smith - Monticello, August 6, 1816 - 1816080
I have received, dear Madam, your very friendly letter of July 21st, and assure you that I feel with deep sensibility its kind expressions towards myself, and the more as from a person than whom no others could be more in sympathy with my own affections. I often call to mind the occasions of knowing your worth, which the societies of Washington furnished; and none more than those derived from your much valued visit to Monticello. recognize the same motives of goodness in the solicitude you express on the rumor supposed to proceed from a letter of mine to Charles Thomson, on the subject of the Christian religion. It is true that, in writing to the translator of the Bible and Testament, that subject was mentioned; but equally so that no adherence to any particular mode of Christianity was there expressed, nor any change of opinions suggested. A change from what? the priests indeed have heretofore thought proper to ascribe to me religious, or rather anti-religious sentiments, of their own fabric, but such as soothed their resentments against the act of Virginia for establishing religious freedom. They wished him to be thought atheist, deist, or devil, who could advocate freedom from their religious dictations. But I have ever thought religion a concern purely between our God and our consciences, for which we were accountable to him, and not to the priests. I never told my own religion, nor scrutinized that of another. I never attempted to make a convert, nor wished to change another's creed. I have ever judged of the religion of others by their lives, and by this test, my dear Madam, I have been satisfied yours must be an excellent one, to have produced a life of such exemplary virtue and correctness. For it is in our lives, and not from our words, that our religion must be read. By the same test the world must judge me. But this does not satisfy the priesthood. They must have a positive, a declared assent to all their interested absurdities. My opinion is that there would never have been an infidel, if there had never been a priest. The artificial structures they have built on the purest of all moral systems, for the purpose of deriving from it pence and power, revolts those who think for themselves, and who read in that system only what is really there. These, therefore, they brand with such nick-names as their enmity chooses gratuitously to impute. I have left the world, in silence, to judge of causes from their effects; and I am consoled in this course, my dear friend, when I perceive the candor with which I am judged by your justice and discernment; and that, notwithstanding the slanders of the saints, my fellow citizens have thought me worthy of trusts. The imputations of irreligion having spent their force; they think an imputation of change might now be turned to account as a holster for their duperies. I shall leave them, as heretofore, to grope on in the dark.
But, I wouldn't spend very much time looking for kernel of truth in Jefferson's view of God. When one is furtive, it is often to hide nothing.