You continue to make the mistake by NOT separating the Gods from the people.
Just because the Aztec people or Carthaginians claimed that they made human sacrifice to their God (or Gods) then that does not make it true or accurate.
Christianity claimed that the Crusades were an act of God under the name of Jesus Christ and those Christian people were not true.
Christians claim that lost souls are burning in some "Hell" and that too is not real and not true.
To throw away religion is not the same mistake as to throw away God.
And concerning human sacrifice then a great Christian Lady named of Ellen G. White (I give her the credit) told a message which I tend to agree that all of humanity since the ancient times of antiquity have had some inner understanding that there had to be a "Savior" as a sacrifice for human sins, and as such this inner knowledge is why human sacrifice can be found in every culture and the sacrifice was always intended to be an innocent or pure victim because they some how knew about a coming SAVIOR.
In the Bible where Abraham was going to sacrifice his son Isaac then it tells that God stopped that sacrifice and the importance of that story is that it marked the end of human sacrifice among the Hebrews.
Genesis 22:11-12
Apparently it is very difficult even for God to get us humans to stop or to restrain our barbaric cruelties.
What you are describing is anti-God which is different from Atheism of no-God.
Atheist just literally means no God(s), so a true Atheist is not anti-God because if there is no-God then one can not be "anti" to some thing which is not there.
You do not go out preaching that there is no "flying spaghetti monster" because you are not anti-flying spaghetti monster.
I agree with you that most of Atheism is just anti-god and anti-religion but technically that is a pro-active and aggressive form of Atheism.
I do not claim any divinity to Jesus as I really see that claim to lower and degrade Jesus so that if Jesus was "divine" then His sacrifice was really just a charade.
We really have to separate Christianity from Jesus because they are vastly different things.
Christianity is a huge bunch of people who make claims about Jesus and about God and the Christian people are very wrong and misguided.
Since you know that Jesus was not divine then that puts you closer to the truth then are the Christians who see Jesus as divine.