BT, hope you had a good weekend.
A tattoo is a form of body modification, made by inserting indelible ink into the dermis layer of the skin to change the pigment.
Tattoo is also a medical term referring to traumatic scars on the skin caused by accidental injury. The Bible is not referring to scars of this kind.
Tattoos are indeed satanic. See Leviticus 19.
Leviticus 19:
27 Ye shall not round the corners of your heads, neither shalt thou mar the corners of thy beard.
28 Ye shall not make any cuttings in your flesh for the dead, nor print any marks upon you: I am the Lord.
29 Do not prostitute thy daughter, to cause her to be a whore; lest the land fall to whoredom, and the land become full of wickedness.
30 Ye shall keep my sabbaths, and reverence my sanctuary: I am the Lord.
31 Regard not them that have familiar spirits, neither seek after wizards, to be defiled by them: I am the Lord your God.
This passage taken as a whole tells us that only God is to be worshiped and I doubt Allah is His prophet. It is understood from this verse that tattoos originated with worship or dedications to the dead (which is Satanic, otherwise God would not have condemned it). The dead are not conscious and they should not be worshiped (glorified saints in some traditions). Despite what popular theology teaches, the dead are not "watching over us" like as if death somehow converts people into heavenly angelic beings capable of omnipresence, omnipotence etc like God.
The passage also includes the sanctuary and sabbaths (celebrations to mark God's deliverance). This refers to the ceremonial sabbaths as well as the weekly Sabbaths, the Lord's Day (the Fourth Commandment now corrupted by some to mean Sunday and not Saturday). The sanctuary was the place where God met His people (Exodus 25:8 - "And let them make me a sanctuary; that I may dwell among them. According to all that I shew thee, after the pattern of the tabernacle, and the pattern of all the instruments thereof, even so shall ye make it.").
The inclusion of whoredom and prostitution is deliberate. In almost all Satanic pagan worship, women were dedicated to goddesses as priestesses and used as sexual objects in worship.
Verse 31 contextualizes tattoos and body paintings further by linking them to witches and those with "familiar spirits" - a reference to the worship of dead relatives or dead people we once knew. Satan imitates them in body and other characteristics (I Sam 28 - Saul and the witch of Endor) and may even speak the "truth" misquoting scripture like he did (Matt 4, Luke 4) to Jesus. His plan is to deceive many, and it seems to be working very well.
Apart from tattoos being dedicated to Satanic worship (extended to the worship of the dead), tattooing also involves blood. Tattoos invariably involve cutting the skin or injecting stuff under the skin. This invokes worship, which in the sanctuary also involved blood. The Bible refers to blood as "life" which means a person tattooing himself dedicates his life to the person being worshiped, whether God or Satan. Christ saved us by His blood (life). Satan imitates this by claiming God's children through his own rituals.
Hebrews 9:22 "And almost all things are by the law purged with blood; and without shedding of blood is no remission."
Anybody with tattoos needs to read Leviticus 19 in context. If you have a tattoo, come to Christ for cleansing by the blood of the Lamb of God slain from the foundation of the world.