What is the "spirit" the returns to god at death according to the Watchtower?
I thought JWs said this refers to the belief that the only hope for a resurrection of an individual lies with Jehovah. That he keeps in his memory the personality and memories of the individual so that he can bring him back to life. I remember they were very keen to ensure that nobody interpret this as a belief in a spirit or soul being immortal and going to heaven but the person is 'asleep' awaiting the resurrection.
I do remember they said God created Adam and then breathed into his nostrils the breath of life which refers to some kind of animating force that only comes from God. Perhaps this is what cofty is remembering. They used Ancient Greek pneuma, breath of life, I remember. Which is confusing because Judaism and Christianity use this word to describe the soul or spirit but JWs are adamant it doesn't mean that.
https://en.m.wikipedia.org/wiki/Pneuma
How to untangle what they believe when their ideas are so confused!