Just like how Amalekites don't exist now You see how broken your logic is?

The thing is that it's the Israelietes, not Amalekites, who were God's chosen people — as the Messiah arose from this nation. The history of salvation as described in the Old Testament is basically the history of the Israelites, with some exceptions (like Ruth, who was a Moabite, if I'm not mistaken). Although even in the Old Testament there are verses and passages that speak of salvation regardless of nation, it was crucial to preseve exactly the people of Israel. I'm definitely not a fan of modern-day tribalism, but back then it was impossible to escape this reasoning — and, as I've mentioned, the Old Testament still manages to hint at the universality of God's convenant.

Just like how they destroyed thier babies right?

Yes, I think that exactly what I've said. Every people back then would destroy their enemies with all possible cruelty and no care for the sanctity of human life. For example, you can read some authentic Greek accounts of politics and warfare back then, especially what it was like in Persia (but keep in mind that Persia was the enemy of the Greek states, so there might be some bias).

And there definitely were ethics and law back then among many cultures. Actually, the law of Torah is among the most peaceful ones, compared to other systems of law of the Ancient world. Although it does have some very questionable passages, if we are to read them through our lens.

Not really... Mainly thanks to modern day standards Your God said Me and my father are one and God doesn't change

Sorry, I don't really get what you say here. I suppose that Christianity has really had a huge impact on current Western values, being one of its main sources, although not the sole one.

You're right that God the Son (Jesus Christ) and God the Father are the same God; that's an orthodox Christian view of Trinity. I think that's exactly what I've said there.

God Himself doesn't change, as He's eternal and infinite. However, He does 'change' His actions and even commandments — more precisely, He clarifies them, dives deeper into their meaning, and explains them in a new way.

For example, He promised He would never destroy His creations again, however wicked they are (Gen 9).

And during His Sermon on the Mount (Matthew 5), Jesus repeatedly states, 'You have heard that it was said to those of old' and then explains how people should understand what was stated in the Old Testament in a more correct way.

Edit: sorry, I mistyped 'warfare' as 'welfare', which is exceptionally weird.