When Friday asks "Why God no kill the devil?" is Robinson Crusoe's response in line with Anglican theology? In Daniel Defoe's novel Robinson Crusoe, the titular character rescues a man from captivity and, since they initially can't communicate, decides to call him &quot;Friday&quot; because that was the day of the week he rescued him.
He eventually teaches Friday about Christianity and finds that although he readily accepts Crusoe's explanations of God and Jesus, he finds the devil to be more difficult to accept. He also asks a question that Crusoe finds very surprising (emphasis mine):

After this I had been telling him how the devil was God’s enemy in the hearts of men, and used all his malice and skill to defeat the good designs of Providence, and to ruin the kingdom of Christ in the world, and the like.  “Well,” says Friday, “but you say God is so strong, so great; is He not much strong, much might as the devil?”  “Yes, yes,” says I, “Friday; God is stronger than the devil—God is above the devil, and therefore we pray to God to tread him down under our feet, and enable us to resist his temptations and quench his fiery darts.”  “But,” says he again, “if God much stronger, much might as the wicked devil, why God no kill the devil, so make him no more do wicked?”  I was strangely surprised at this question

After pretending at first not to hear him in order to buy time, and reflecting on the fact that he isn't really qualified to answer such deep religious questions, Crusoe comes to this explanation (emphasis mine):

By this time I had recovered myself a little, and I said, “God will at last punish him severely; he is reserved for the judgment, and is to be cast into the bottomless pit, to dwell with everlasting fire.”  This did not satisfy Friday; but he returns upon me, repeating my words, “‘Reserve at last!’ me no understand—but why not kill the devil now; not kill great ago?”  “You may as well ask me,” said I, “why God does not kill you or me, when we do wicked things here that offend Him—we are preserved to repent and be pardoned.”  He mused some time on this.  “Well, well,” says he, mighty affectionately, “that well—so you, I, devil, all wicked, all preserve, repent, God pardon all.”  Here I was run down again by him to the last degree

His final frustration seems to be over the fact that the devil isn't expected to repent and be pardoned, unlike they are, and decides to change the subject.
Assuming that Robinson Crusoe is Anglican*, is his response in line with Anglican theology (either at the novel's publication in 1719 or today)?

* Elsewhere in the novel, Crusoe mentions that Friday became a Protestant. Since Crusoe is from England, I'm going to assume that both Crusoe and Friday are more specifically Anglicans. Note that author Daniel Defoe was born to Presbyterian dissenters and he himself attended a Unitarian church, but given that there was persecution of non-Anglicans at the time that the fictional Crusoe doesn't face in this novel or the sequels when he returns to England, I'm just going to simplify this and assume he is Anglican.
Your presumption that Defoe's character Robinson Crusoe was an Anglican appears to be a matter of highly speculative opinion. The Wikipedia page detailing DeFoe's biography states that his parents were Presbyterian dissenters, and that his education was in Presbyterian and Unitarian institutions, and that he was associated with Unitarianism. Under these circumstances, it would seem that there is little theological basis that is specifically Anglican in Robinson Crusoe. Further, as I recall from past reading,  for several hudred years between th Accession of Elizabeth I following the death of Queen Mary, and the resulting restoration of the English Reformation,  the Church of England styled itself as the Catholic Church, not the Anglican church. Under English law it was illegal for an adherent of the Roman church to use the term "catholic". So when Defoe writing "Robinson Crusoe" uses the term "protestant", it is juxtaposed against the situation that what we now know as the Church of England was legally the "Catholic" church, and in that context, "protestant" would likely have meant non-conforming disdenters.

Having written that, it should be noted that during DeFoe's lifetime, the Church of England had a much more Calvinist component to it's theology than the catholic influences that would enter with the Oxford Movement about a century after DeFoe's death.