If you are a Christian the Holy Spirit lives within you, you are owned by God. You have the mark of the Holy Spirit, Satan can not do anything about it, he can never mark you as one of his. The mark of the beast is an allegorical(I think that's the term) Figure of speech that readers of that century would of understand, and the number thing they would of understood too since they had meanings for certain numbers back then.
Masters of slaves would mark their slaves on their forehead or hand, What God was and is trying to say through John is that those that are a slaves of Satan or are sons of Satan will have (figuratively speaking) the mark of the beast, Satan. Satan can not mark those that are owned by God because God has sealed us.
What goods does it do to live by physical bread alone, you will still die eventually, but if you live by the living bread which only Jesus can give you, you will never die.
As far as any further arguing or discussion about what the Mark of the beast is, I'm not going to do it, it's not worth the time and effort.
Just wondering what other parts of the Bible you have decided are allegorical. Jesus' miracles? The virgin birth? Commandments not to murder or fornicate?