Yes, it is that complicated, and as
@Redemptionsong said, you have incompetently chosen to isolate certain passages that are only a fraction of the picture as a whole. Not only did you not employ a comprehensive approach to exegeting the Scriptures, but the actual meaning behind the passages that you chose to support your position has entirely eluded you.
Yes, Christ is within all of us, provided that we remain in him, and even then, the significance of that principle is extremely difficult to understand, as the Apostles themselves were not perfect.
Your simplification of a very profound principle, that also, without a doubt is figurative, does absolutely no justice to Christ or the Gospel.