The wording of the scriptures testify that it is a literal temple,for it tells of the man of sin,the son of perdition,who is a man,a human,which also Judas Iscariot is known as the son of perdition,and this human steps in to the temple,and claims to be God,so it has to be a literal temple for a man cannot sit in us,let alone sit in more than one person.
Also he steps in to the temple of God,showing that he is God,which a person that is not saved is not a temple of God,for only the saints are a temple of God,so how can any person even if spiritual sit in them when they are right with God,and he exalts himself above all that is called God or that is worshipped,which this would have to be a claim that can be seen by people,which the Bible says the last king will not acknowledge the God of his fathers,but in his estate he will honor the God of forces,and a God his fathers knew not,and will not regard any god,but magnify himself above all,which would have to be a human person in visible form to people.
The way the scriptures is worded it has to be a literal temple,which a man steps in to the temple and claims to be God,which he has gained the most power through nature than any other person will attain,and there is no personal God,so he is top dog,and he gets his power from Satan and deceives all who do not love God,which the first people he wants to deceive is the Jews,which they went back to animal sacrifices and he stepped in their temple and told them to stop,and he is their God and Messiah.