I agree. Lewis weaves Scriptural truths into his works, but to push things to far is, well, to push things too far.
On that note, and watching the paramenters well, I would like to answer a comment made by Vanceone, and about which he asked for reply:
Vanceone said:
However, I do agree that the devil, or Tash as Lewis puts it, can tempt us, and lurks within each of us.
First, continuing this thread along the lines it held before, I would strongly agree that Tash is the Devil according to Lewis' allegory, or the closest he wishes to get to it. There is no doubt that Lewis believes in the Devil as an independent, intelligent and willful being, once good, but fallen and rebellious. Perhaps his best description of him is not (as most would think) in the
Screwtape Letters, but rather in the possessed Weston of
Perelandra.
That said, I cannot subscribe to the idea that we all have this being "lurking within us" (to quote you precisely, Vanceone, not to make light of your words). I truly understand this perspective, given human behavior. But it is on this point that I may be inclined to agree with Wallis, if such was his intention: Some (not to say you) may take this to adopt a "Devil made me do it" attitude, and thus exculpate themselves from responsibility for their actions. We are not granted that luxury. We are fallen, willful creatures, and fully capable of sin on our own. That the Devil constantly works to facilitate this activity by drawing us into more sin (as you note correctly) does not negate this simple truth. It is our sinful nature (or "flesh," as Paul and others put it) that "lurks within" (see Romans 6 and Galatians 5 especially for this). The other problem with adopting this view of the Devil is that some may feel that their situation is hopeless. If I have the Devil within me, even as a Christian, what hope have I versus sin? Again, Romans 6 addresses this reality as well: Christ's crucifixion put to death the sinful nature in us, and though it is a lifelong struggle to mortify the flesh, the work is done and the reality will be fully consummated at the Second Coming.
Of course, the real kicker is that nowhere in the Scriptures is there anything that indicates the Devil himself lives within any human being continually. Yes, Satan "entered into" Judas the night of Jesus' betrayal, and there are multiple instances of demonization in the Scriptures. But the term "possession" is not even Scriptural (oddly, the terminology is usually reversed: The person "has" the spirit, not the other way around), though we often use it (as I did in referring to Weston). Judas' remorse was certainly not inspired by the Enemy, who had used him for his purposes, and moved on. We have to conclude that the Devil is not an equal and opposite of the Holy Spirit: he cannot be in all places at once, he is limited. That which we see in ourselves and others is the sinful nature. Of course, when it comes to our actions, one may very well argue that we might as well have the Devil with us, given how we act sometimes, but the distinction is important for the reasons I have named.