Was God different in Old Testament times compared to New Testament times? Origen, one of the Church fathers, lived 185-253. He addressed this question, which was being asked in his day: Why was God so harsh on the Amalekites?
Origen thought about this, deciding the Bible had to be read as a whole, particularly considering the last book, Revelation, where the Lamb (Jesus) opened the scroll (the Bible). This will show how early on the Catholic Church did not take every Biblical story literally, how allegory was often used.
What is your take: Did God literally command the deaths of all the Amalekites, their crops and animals destroyed? If so, why that command?
I am not a Bible literalist. I think of myself as a Bible realist. As such I don't believe God dictated every word of the Bible but I do believe the Holy Spirit inspired at least most of the words written down by the people of the Bible.
The many manuscripts and bits of manuscripts that make up the Bible contain parts of the Law, history, allegory/parable, wisdom sayings, doctrine, poetry, prophecy, metaphor, mystery/visions all from the experience, perspective, and language available to the people who wrote down the words.
There is no way that thousands of years of events and concepts all made it into the Bible but we get a pretty good sense of those times via the manuscripts that we have.
And even with the relatively limited scriptures we have, Bible Scholars have spent a lifetime piecing together the meaning of all of it and why it is most likely in the Bible.
The Old Testament speaks of a God of mercy and blessings but also a God of wrath and vengeance. The ancient Jews of that time were firm in their belief that everything that exists, that happens is via God's hand. Somehow they were able to avoid the dichotomy that God was righteous but, if everything that happened was via his will, then he also would cause people to sin and then punish them for what they did. A recurring theme of Creation, sin, punishment, vengeance, rescue/redemption is wound through most of the manuscripts. That God doesn't appear in New Testament manuscripts.
By New Testament times, the manuscripts focused on Immanuel, God with us, God became man and lived among us, and the Christ in the form of the Holy Spirit is always with us. Now we have a God that is not only a God of mercy and blessings but a God of Love, of Salvation, and promise of eternal life.
Same God. Different perspectives.