1.  Julius Caesar commonly gave pardons to his enemies, just like Jesus told His followers to "love thy enemy".

Caesar's pardoning of his enemies was essentially a self-serving political ploy to gain the support of his enemies and thus increase his power.  Caesar never told anyone to love their enemies, or claimed to love them himself.

2. On the verge of being proclaimed King, Caesar was betrayed and murdered by those he had saved. His friend Marcus Brutus sanctioned this act and participated in it. And his trusted general, Decimus Brutus, was an essential part of the conspiracy. The whole Senate fled from the scene.

Jesus is portrayed as being hailed as, or about to claim the title of, King of the Jews. He is then betrayed by his friend, Judas Iscariot, and abandoned by all around him ("..and they all forsook him, and fled." Mark 14:50).

For one thing, Jesus wasn't betrayed and murdered by those he had saved.  Neither Judas, the pharisees, Pilate, Herod nor anyone else involved in putting Jesus to death were true followers of His (there are some claims that Pilate later became a Christian, but this claim is in doubt).  Also, Jesus was not 'about to claim the title of' King of the Jews, but was being hailed as such a king against His will.  So it doesn't really compare to Caesar's being about to claim the title of King, a title Caesar welcomed.

3. The evening before his murder, Caesar attended an intimate supper where wine was passed around and he prophetically spoke of his death. The arch-traitor, Decimus Brutus, was present at the table.

The evening before his execution, Jesus attends the "Last Supper", where wine is passed around and he speaks prophetically of his death. The traitor Judas is present at the table.

Actually, Caesar did not prophetically speak of his death, but just made the comment that he would prefer a quick death over a slow one.  He was not predicting his death, as Jesus was.  Also, it's odd that in every other claim made by this person, Judas is compared to Marcus Brutus, but here he's being compared to Decimus Brutus.  Which is it?  As for the comparison of wine being passed around, it's passed around at many dinners.

4. Immediately prior to his assassination, Caesar was mocked in his royal purple robe whilst wearing his crown of laurel.

Immediately prior to his execution, Jesus is mocked in a purple robe, and crowned with a wreath made of thorns.

Kings frequently wore purple robes and crowns.  In fact, the reason the Romans put the purple robe and crown of thorns on Jesus was to mock the people's claims of His kingship.  Caesar was not mocked by being put in a robe and crown, as Jesus was.  If he was mocked, it had nothing to do with what he was wearing.  It just happened to be what Caesar was wearing when he was attacked.

5. When Caesar was attacked, his 1st lieutenant and religious deputy, Mark Antony, who feared for his own life, fled, disguised himself, and hid well into the night. All others present who had sworn to protect Caesar fled in fear.

When his tribulations begin, Jesus' deputy Peter denies knowing him, although he had sworn unswerving allegiance to him.

First of all, Peter wasn't Jesus' deputy, nor was his relationship to Jesus anything like Mark Antony's relationship to Julius Caesar.  Antony was Caesar's spiritual guide, while Peter was hardly Jesus' spiritual guide (the other way around is more like it!).  Also, Antony fled AFTER Caesar's murder (he wasn't at the scene, and fled only when he'd been informed of the murder).  Peter deserted Jesus the night before His death on the cross.

6. Caesar's body was ferried home amidst public mourning and wailing women.

Jesus is led to his fate, and then to his burial, in the accompaniment of grieving women.

Okay, so the only comparison is that women grieved at their deaths?  Wouldn't such a thing be true of all well-loved people?  Maybe this is another one for my Jesus/Elvis page.

7. Marcus Brutus later committed suicide, when he realized that his Republican cause was lost. Decimus Brutus was later executed.

Judas Iscariot suicides in remorse.

I'm not sure what the execution of Decimus Brutus has to do with anything here, but we do have the facts that both Marcus Brutus and Judas committed suicide.  But their methods of suicide and reasons for doing it are quite different.  Brutus threw himself on a sword (or by some allegations, asked a friend to stab him to death).  Brutus did it because of his lost political cause.  Judas hung himself, and did it because of his guilt over his betrayal of Jesus.  Also, Brutus was Caesar's executioner, while Judas was not Jesus' executioner, but only betrayed him.

8. Caesar was subsequently resurrected as a God - Divus Iulius.

Christ resurrects to glory.

Caesar was not "resurrected" in any sense, but was given a godly status while dead.  Absolutely no one made the claim of Caesar coming back to physical life after his death.

9. Caesar's death on the 15th of March is around the time of Passover (when Jesus died)

The best estimates as to the date of Jesus' crucifixion seem to fall between March 28th and April 6th, meaning that their deaths are off by roughly two or three weeks (not counting the many, many years between them).  So pretty much anyone who dies in late February, any part of March, or early April dies around the same time as Caesar by this critic's definition.  This is roughly 10% of the world's population.  Hardly a big coincidence that Jesus falls into it.

10.  The names Brutus Sicarius (Brutus the Assassin) and Judas Iscariot sound alike.

They sound a little alike.  Same number of consonants, similar vowel sounds, a few of the same letters.  But to suppose that "Judas Iscariot" was a bastardization of the name "Brutus Sicarius" doesn't make much sense.  First of all, while Brutus was an assassin, he was not commonly referred to as "Brutus Sicarius" any more than we refer to Lee Harvey Oswald as "Oswald the Assassin".  Try putting the name "Brutus Sicarius" into search engines, and the only hits are web sites espousing the Jesus/Caesar comparisons.  No one else seems to be familiar with this 'alternate' name for Marcus Brutus.  Also, since Judas wasn't an assassin, why would he take the name of an assassin?

11.  The sun darkened at Caesar's death.

Gary Courtney, the source for most of these comparisons (his site is here), E-mailed me to point out that the Antiquities reference was in chapter 12, part 3, in which Mark Anthony speaks of "great wickedness towards the gods; for the sake of which we suppose it was that the sun turned away his light from us, as unwilling to view the horrid crime they were guilty of in the case of Caesar".

He also gave me three other references:

One is Pliny's book 7, verse 93, which I'm having trouble finding.

Another is Plutarch's "Life of Julius Caesar", chapter 69, which speaks of "the obscuration of the sun's rays. For during all that year its orb rose pale and without radiance, while the heat that came down from it was slight and ineffectual, so that the air in its circulation was dark and heavy owing to the feebleness of the warmth that penetrated it"

The last is Virgil's 1st Georgic, verses 466-467, which says the sun "pitied Rome when Caesar was killed, and hid his shining face in gloomy darkness"

So, yes, there was a dimming of the sun after Caesar's death, which was likely due to the eruption of Mount Etna in the spring of 44 A.D.  I'll leave it to you to decide how much similarity there is between a year-long dimming of the sun and a 3-hour darkness.