"The Old Testament didn't have Jesus who died for our sins yet"

You mean the original sin... The one where everyone is a criminal because a couple of people who couldn't tell the difference from right and wrong, and were therefore not responsible for their actions, made the mistake of acquiring morality... the knowledge of right and wrong? So, you mean the original sin that we personally didn't have anything to do with other than as the alleged offspring of people who god punished for becoming morally aware?

"We humans are all naturally evil."

Right... I think we've covered the source of that idiocy.

"We all sin all the time"

Do we now? Really? So, are you saying then that buried under that is an excuse for the genocides? That you can think of any cause that justifies running down children fleeing from combat and chopping them up with a sword?

"God had wars against the ones that were warring against his people"

Hang on a sec... No he didn't. He is accounted in some cases of killing large numbers of people by mysterious means or by natural disaster, but not war. Wars occurred allegedly at god's command... your claim that those wars were waged by god is a statement that you can in fact morally justify cutting children up with a sword, and that is simply revolting.

"So since we have Christ, we able to be forgiven of our sins unlike the people in the Old Testament."

Basically, you're claiming that it wasn't possible for god to act adult about forgiving people for being human and doing exactly what he allegedly designed them to do, which necessitated that he kill huge numbers of innocent people... and that his solution for that was to have sex with his own mother, to get her pregnant with himself, and then live a perfect and moral life so that he would be completely blameless when he tortured himself to death?

Since when does killing someone who is completely guiltless atone for anything that someone else has done? Since when is killing an innocent, justifiable for any reason? Since when is it justice to punish anyone else other than the person who actually commits a crime?

"I'm not trying to start some crazy argument, I'm just telling you the Truth."

Sounds like this is something you've convinced yourself is true, rather than anything you could possibly justify in any other context than religion.

I'm accustomed to use of the word "true" where there is evidence to support the verity of the assertion.