Q: Where is Jesus' spirit now? Is part of it in humans also?
A: Thank you for your note to Truthbook.
Jesus is personally resident on Salvington, the sphere from which he rules this universe in "supreme sovereignty."
Although Jesus is no longer with us in the flesh, he did send the "promised helper" on the day of Pentecost.
You can read about this helper—The Spirit of Truth— HERE
And you can read about what happened on that day of Pentecost HERE
Jesus is very definitely a part of every human's life now, as he indwells every person and leads all believers into all truth.
Thank you for your question. I hope that you will click on the links above, and read more about this ever-present good Spirit that helps every one of us strengthen our connection to the Master.