#1: I’m all for sacrificial love, like Jesus’s death is portrayed symbolically in the Chronicles of Narnia. My problem is the idea of God (the Father) demanding that sacrifice. For it to be a sacrifice made of love, some outside force must be demanding it. If God himself demands human sacrifice, God is not good.
For the record, God isn’t really the ”very source of Life”. There are older things in the spirit realm. There are more destinations than heaven and hell. You’ll probably call it Satan’s deception, but I have seen far too much to believe in the exclusivity of any religion. (No, I didn’t fall for witchcraft or New Age practices. I was born with the ability to see and talk to spirits.)
#2 That’s rubbish. We have archeological evidence (and textual evidence from the Bible) that Yahweh was originally just a minor god of Canaanite pantheon. If you’re interested, I recommend Thom Stark’s ”The Human Faces of God”.
As for (blood) sacrifices, I don’t remember seeing any instances where the prophets would say that do offer sacrifices, but do it with a correct mindset. For example Hosea (quoted by Jesus) and Samuel and David (in 1 and 2 Samuel) pretty plainly say that God does not want sacrifices / burnt offerings.
There’s also the little problem that if all the books of Torah are equally valid, sacrificing your firstborn child to God was a divine command. It was ”everything that opens the womb”, not just with animals they owned. Prophets speak against this too. I don’t remember the names, but I think one said God did not mean that, another that God gave people bad commands to punish them.