so Gossip Girl books are basicall written pornography for girls who have not reach puberty.
Are there not already laws with regards to selling sexual materials to minors?
At the very least should they not be behind the register and only sold to adults?
There is the occasional witch, but always shown to be a bad guy right away. Lots of creatures out of classical mythology, because Lewis was a classical fellow, but in Narnia it is classicism tamed and subject to Christ. Only once, IIRC, does a good character attempt a "spell". It is immediately shown to be a Bad Thing, and she repents very sincerely within a page or two.
They are relatively short novels, entertaining and well written. I think it would be worth your time to read them yourself to make sure if you think they're appropriate for your children. It has magic, but it's definitely not a Harry Potter type of DIY "if only you had the secret" type of magic. Lewis always portrays any attempt at the supernatural without going through God as evil and not to be done.
Narnia is not bad, just the opposite.
It is an alligory of christianity.
It has been around for decades.
The magic is no big deal...in the books, the source of all supernatural power used for good is Aslan (the Christ figure), and only those who are definitely evil use any other "magic." In fact, IIRC, I don't think that the supernatural things Aslan does for his allies are ever called magic, but simply are in effect because he has the power to do them.
C.S. Lewis did a very good job.
It's not the same level of literature as Tolkien, but in terms of reading aloud it's even better, because you don't get bogged in Tolkein's long, detailed background digressions and setting descriptions. (Though Tolkien is superb for older readers.)