Is the story of Jesus' life based on pagan myths?

Skeptics occasionally allege that the accounts of Jesus' life, death and resurrection were copycats of pagan gods and myths. The following articles are all offsite.

General articles (offsite)

Glenn Miller has a multi-part article covering:

Standards for determining if something is a copycat and other considerations
Alleged resurrected gods: Adonis, Baal, Hadad, Attis, Marduk, Osiris, Tammuz, Melquart, Eshmun
Other gods, including Osiris (again), Dionysus, Mithras, Buddha, Horus, Krishna
The extent of pagan influences on the Gospel writers

Was the New Testament Influenced by Pagan Religions? by Ronald Nash

Mithras (offsite)

Did The Mithraic Mysteries Influence Christianity? by J.P. Holding

Osiris (offsite)

Comparing Osiris, Horus, and Jesus by J.P. Holding
Mark McFall responds to Osiris copycat allegations by Farrell Till: part one and part two. (These articles are taken out of a frameset - see In The Word)

Dionysus (offsite)

Did The Greek God of Wine Influence Christian Beliefs? by J.P. Holding

Related articles (offsite)

Glenn Miller has a series on Did the disciples invent the miracle stories of Jesus?