Deuteronomy 18:9, 12 When thou art come into the land which the Lord thy God giveth thee, thou shalt not learn to do after the abominations of those nations…For all that do these things are an abomination unto the Lord..
Once we have been born again and have entered into the Kingdom, our faith response is not to learn to do after the abominations of the godless, pagan world around us. The God who loves is still a jealous God who will not tolerate any kind of worship or faith of any false god. Therefore, we will not be curious about or seek to even learn the ways of the world. False gods, false worship, false philosophy and false religion is regarded by the Lord as an abomination, a terrible, evil, and ugly thing. And we will see it the same as God sees it, and avoid it.
In this context Moses lists child sacrifice and various kinds of occult and demonic practices. Certainly, we can easily see human sacrifice and Satanic worship as abominations. It is a little harder to see illicit sex, drug use, and fortune-telling as abominable. It is even harder to see abortion and false doctrine, for example, in the same light. But God is serious, and so are we.
Sin is a terrible evil, no matter how small it may seem. Just look at the disgusting, innocent, suffering of Christ to see the abominable evil of your own sin. And as God He took our abomination on Himself. Then appreciate what Jesus did for you by believing Him.