Pagan influence on Christianity?

I just realized the name of the book I once heard about that talked about the bible being a collection of Pagan Myths. If you try hard enough you can find information that obviously refutes this and will enlighten you on how the author came about his conclusions. The title of the book is "The Pagan Christ" by Tom Harpur and published by Thomas Allen Publishers in 2004. Below is an extract from this site which looks at the problems with this book.

Harpur does not quote any contemporary Egyptologist or recognized academic authority on world religions, nor does he appeal to any of the standard reference books, such as the magisterial three volume Oxford Encyclopedia of Ancient Egypt (2001) or any primary sources. Rather, he is entirely dependent on the work of Kuhn, who he describes as "the most erudite, most eloquent, and most convincing . . . of any modern writer on religion I have encountered in a lifetime dedicated to such matters." 

There is no mention of Osiris in Egyptian texts until about 2350 BC; so Harpur's reference to the origins of Osirian religion is off by more than a millennium and a half. Elsewhere, Harpur refers to "Jesus in Egyptian lore as early as 18,000 BCE"; and he quotes Kuhn as claiming that "the Jesus who stands as the founder of Christianity was at least 10,000 years of age." In fact, the earliest extant writing that we have dates from about 3200 BCE.

The book compares Jesus to many Pagan Mythological figures. one of whom was "Horus." Below is a short list stating which comparisons are false. There are more but you can go to this link to view them

• Isis was Horus mother and wasn't a virgin. 
• He didn't cast out demons or any miracles like what Jesus did. He didn't walk on water
• He wasn't crucified (that wasn't around till a few centuries before Jesus)
• He wasn't resurrected
• Jesus isn't believed to be born in December. This one was actually pagan because they had no clue when he was born

You can check out all the frequent comparisons here. The list is a long one and each is refuted as far as  I can tell.

Some also state that Christianity isn't even the oldest religion. "Christianity" is obviously only 2000 years old. Worship of the Christian God however is older than any of those mentioned. Christianity is a new word, but it goes back beyond Jesus.

Comments are welcome. Feel free to read this article on tecktonics.org