What exactly are the things that are an abomination to the Lord?

The general meaning of the word "abomination" or abominable" is: Something detestable, unlawful or repulsive.

Regarding the New Jerusalem the Bible says, "But there shall by no means enter it anything that defiles, or causes an abomination or a lie, but only those who are written in the Lamb's Book of Life."  Rev. 21:27.  Also Rev. 21:8 says, " But the cowardly, unbelieving, [some text adds "and sinners"], abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars shall have their part in the lake which burns with fire and brimstone, which is the second death."

The following is a list of things that God considers an abomination:

So it is abundantly clear from scripture that ALL SIN is considered an abomination by God and to single out any sin as worse than another is NOT rightly dividing the Word of Truth!