A likeness of sex: Pornography is the ultimate likeness or appearance of sex. Pornography can only offer the appearance of the sexual experience. God created sex as a physical, emotional and spiritual experience, and porn can only give a partial representation of it.

Extreme devotion: Porn's erotic appeal powerfully captivates its viewers, leading them to extreme devotion to finding more porn to look at.

False conceptions: Porn is awash with lies about sex (see lies of sex addiction). Its depictions are built on sexual sin, so it's no wonder that porn addicts often have a warped understanding of what God's plan for sexuality is. Homosexuality, incest and adultery are examples of the false concepts that porn glamorizes.

Idolatry is sin: Idolatry is specifically identified in the Bible as sin (Exodus 20:3-5, Exodus 20:23). God's primary command to us is that we love God with all our heart, soul and mind (Matthew 22:36-38). It is impossible to love God with all our heart, soul and mind when we are idolizing sex images in our eyes and thoughts.

Idolatry damages our relationship with God:

Diverts our devotion away from God (Deuteronomy 31:16)
Causes spiritual confusion and damages our discernment of right and wrong (Isaiah 41:29, Isaiah 45:15-16, Hosea 7:11)
Gives place to a “deluded heart” which misleads us (Isaiah 44:20)
Causes generational curses (Exodus 20:3-5)
Causes a root bearing poisonous fruit and wormwood in our life (Deuteronomy 29:17-18)
Allows evil spirits to influence us (Isaiah 19:3-4, Leviticus 19:29, Deuteronomy 12:31, Hosea 4:12-14)