"How? What makes you so sure about this?
Conservation of energy and the consistency of physics.
" What scientific evidence do you have to support your conclusions?"
See Noether's theorm and the Ward-Takahashi identity and also note that there are no examples of processes violating the conservation of energy principle.
"If the machinery which gives rise to intelligence self-assembled, then the machinery becomes the creator and hence replaces God."
No.
"All you've done is replaced God in the universe with a machine as an explanation of how intelligence arose."
W/o the machinery there is nothing to support the functions of intelligence.
If the machinery self-assembles, doesn’t that imply that the machinery has intelligence of it’s own?
How else would something mindless self-assemble into something producing intelligence?
I can see intelligence before machinery, but machinery before intelligence just doesn’t work.