How can we be in Christ Jesus when Jesus has a physical body? Two objects cannot occupy the same space at the same time.
The answer is that Jesus is not just the name of the BodyOfGod but Jesus is the name of the SpiritOfGod and Jesus is the name of the SoulOfGod.
You see there is One God Deu 6:4 who is SpiritSoulAndBody Gen 1:26 1Th 5:23 whose name is Jesus Act 4:12 Phi 2:9-11 .
So, when we receive the evidence of the SpiritOfGod Joh 1:1 and the SoulOfGod Joh 1:1 as manifested in the BodyOfGod Joh 1:14, we receive the Holy SpiritOfGod Joh 14:26 who abides in us and we abide in Him Joh 15:7.