Not really because skeptics are complaining that the NT writers can't be believed because they wrote decades after Christ's death.
That's only one "complaint" among the many made in this thread. You have yet to provide evidence for even the existence of the NT writers, most of whom aren't talked about anywhere BUT the Bible.
I have shown that almost all of our info about Alexander the Great (who did very extraordinary things) comes from historians who lived over 400 years after his death.
No, you haven't. You've brought up a couple of those 400-year-later historians. You haven't even touched the other types of evidence for Alex's existence. And while he did do extraordinary things, none of them were physically impossible (like rising from the dead).
This shows us that 400 year old historical evidence can be very important in our educational system.
Since you haven't shown us that value, no, you haven't. Historical evidence of considerably greater age is used all the time in our educational system. The difference is that it's corroborated multiple times by multiple sources, not just by itself. And none of it violates the known laws of physics. Like it or not, the Bible is NOT a history book. The fact that some of it does, indeed, match up with known history is more coincidence than design. It was never meant to be a history book, any more than it was meant to be a medical text book.
And thus this fact decreases the value of the skeptics argument that the writings about Christ were decades after his life. And if we have decreased the value of the skeptic argument against the truthfulness of the NT it is only common sense that we have helped the argument for its truthfulness.
See above. No, it doesn't. And even if it had, proving one argument wrong does NOT automatically make the opposite side of the argument right. They could easily both be wrong. You've been told this before. Sticking your fingers in your ears and shouting "La-la-la-I-can't-hear-you!" at the top of your lungs STILL doesn't make you right.
And you wouldn't know common sense if it bit you in a sensitive area. Your "common sense" has so far allowed you to ignore huge areas of several different scientific disciplines, simply because they disagree with your preferred doctrine. The attitude is all too common in this country (US), but it's still not sensible. Millions of wrongs still don't make a right.
Stop derailing your own thread ranting about Alexander the Great. You keep carping at us about being off topic. Well, you've strayed from your proposed OP more often than anyone else here. Care to get back to it?