Jehovah's Witnesses
Check out Marcion of Sinope
A first year bible student can see how wrong this man was. Again, denying the Diety of Christ is his first issue.
So we start with a basic question or two.
Who, in the garden, bent down and formed man from the dust of the ground? Who, in the garden, breathed into that man the breath of life?
When you can answer that (and it wasn't the Father) you'll be on your way.