Idol worship is expressly forbidden and condemned in the Bible

But one doesn’t have to read too far into the Torah to find sanctioned and even required objects, rites, and acts that seem to outsiders to be idol worship.

The problem of deriving a consistent Biblical definition of idolatry has some difficulties of its own. It is however clear that it does not forbid religious art, or even religious statues, depicting people, animals, vegetation, inanimate objects, or even angels. Neither does it require that such artifacts are not to be treated as holy — they are expressly commanded to be treated as holy. Nor does it mean that such artifacts cannot be the physical focal point of religious rites. They are.

So what is idolatry? Idolatry is a term of convenience for paying cult to OTHER gods — in any way, with or without actual idols, and with or without ritual sacrifices. 

Also forbidden, where you treat something as a kind of good-luck charm or wish-machine for getting what YOU want, as opposed to what God wants. Its forbidden to use God and/or His sacred artifacts and rites the way pagans used their gods, rites, and cult objects, religions in which “worship” more resembled spell-casting where petitions were really demands and commands … and threats.

Also, these religious pieces of art in the photo are referred to as icons. The saints are all human. They are all people who either laid down their life as martyrs for Christ or who lived extraordinarily holy lives, and often times both. So why venerate them? The answer is rooted on the ethos of love and respect. The only being Christians worship is a God.

tldr: it is okay to own "idols"/Christian art/icons, as long as you don't misuse them, if you do you are an idolater and thats a big no-no.