You speak as if the spiritual is not real. Spiritual is more real than physical. The spiritual created the physical.
By faith we understand that the worlds were framed by the word of God, so that the things which are seen (physical) were not made of things which are visible (they were made of the invisible spiritual)...Heb 11:3.
How can Christ be living in every believer everywhere in the world and be in a heavenly sanctuary at the same time?
This is not a very strong argument..
Bodily in heaven....
Acts 1:10 And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel;
11Which also said, Ye men of Galilee, why stand ye gazing up into heaven?
this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
Promises the comforter....
John 14:16
And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
John 14:26
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
John 15:26
But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
John 16:7
Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.