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The thirty-nine articles are an Anglican doctrinal standard.
The Old Testament is dealt with in Article Seven. It specifically denounces the view that .the old Fathers (i.e. the Old Testament folks) looked only for transitory promises. It asserts that in both the Old and New Testaments everlasting life is offered to mankind.
The Old Testament is not contrary to the New: for both in the Old and New Testament everlasting life is offered to Mankind by Christ, who is the only Mediator between God and Man, being both God and Man. Wherefore they are not to be heard, which feign that the old Fathers did look only for transitory promises.
Anglican doctrine then appears to run counter to your understanding of yesterday's sermon.
However it is very widely understood in Christianity that God revealed His plans through the prophets and, since they lived at different times, this happened gradually. Those in earlier times had a lesser picture than those of later times.
So, while it is true that in some ways the people in Old Testament times knew more than we do: their knowledge of the Book of Jasher being an example; it is also true that in some ways we know more than they did. Our knowledge of Jesus Christ is an example.
As the start of the Epistle to the Hebrews begins:
God, who at sundry times and in diverse manners spoke in time past unto the fathers by the prophets, has in these last days spoken unto us by his Son
Thus, having less knowledge, they arguably needed more faith.
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This question is too broad, as there are a number of groups which call themselves "Anglican", and they do not all share the same Theology. To answer the question originally posed, one would almost have to know exactly which Parish the original poster attended.
That written, the closest thing that there is in most of The Anglican Communion to an official written theological position agreed to by most Anglicans is the Articles of Religion, sometimes called the Thirty - Nine Articles, which does not directly address question.
I expect that most Anglican Theologians would agree with the preacher's first statement, that the prophets in pre-Christian times did not know everything we know today. They did not know about the electrical nature of lightning as we do today, for example, because they had no concept of atoms, much less protons and electrons.
On the other hand, the statement that they had no concept of life after death is more controversial. Even if their writings do not speak to this issue, the fact that their surviving writings do not record anything to refute the preacher's statement does not mean that the preacher's supposition about what they believed is true as to the statement that the Old Testament prophets had more insight because they had direct contact with God, what is the basis for believing they had better direct contact with God than you or I do? In the words of the spiritual, "...He [God] walks with me and he talks to me...". As to the books they may have had, since we don't have them now, we have no way to evaluate them to know how good they may have been.