Jesus and the Father are One, but not the SAME.
Don’t confuse God’s nature with Man’s nature.
We are made in the Image of God.
Man is three on one. Our Body, Our Soul, and Our Spirit.
Now, you don’t normally think think of these as separate, but they are.
When you die, your body is separated from your soul and spirit.
And so, it is with God, He is Three in One as well (This is a very rough analogy, we are but a dim image of God).
I would go to athensation creed to get a good explanation.