I'm offended that you think yaweh is so evil lol..
Anyway, to answer your question these beliefs were in place long ago where people's mindset were a lot more different and gullible. It's not a matter of this god is good so worship them. People are actually scared into believing. Like now for instance, they show violent pics of hell to children to scare them into believing.
That was pretty prevalent in antiquity, and Moloch was not the only deity that received child sacrifices. Judges 11 details the sacrifice of the daughter of Jephthah as an act of thanksgiving for having won a series of terrorist campaigns against the Ammonites. Imagine parents offering their children as burnt sacrifices for Thanksgiving the third Thursday in November in our culture!
This seems to have been normal enough to be included in the Bible with no moral judgement against Jephthah, except maybe don't make promises to Jehovah you cannot keep.
Child sacrifice is not a thing of the past: Christians in Uganda are still practicing. Media always is apologetic towards Abrahamic religions and the people who sacrifice children are called 'Ugandan witches' but whenever these 'witches' are questioned by media in this profoundly Christian nation they immediate cite Abraham and the Bible as their example to justify the idea that God accepts human sacrifices. And so these are people who believe in the Bible.
Another form of child sacrifice is taking place in Nigeria where more than 15,000 minors have been accused of witchcraft in recent years and about 1,000 have been burnt or killed by their own parents and pastors (as per the legal code in Deuteronomy).
People are brought up not to question authority & tradition.
Respecting authority & tradition is a good thing & the basis on which civilization is formed. But some pushing of the boundaries, asking questions is a good thing, that is how we advance. But unfortunately religion is the ultimate tradition & god is the ultimate authority. People just don't question them enough & most just blindly accept them.
And as civilization progresses, our morals keep changing. And people just just turn a blind eye to evils in the religion, dismissing it as traditions of the ages gone by.