I would like to see your break down your belief structure a bit more, so I can understand it.

Which of you do you believe?

1. That CO2 isn't a greenhouse gas? 2. That increasing the concentrations of CO2 in the atmosphere doesn't influence global temperatures? 3. That human activity hasn't increased CO2 concentrations significantly.

If you answer those, we'll be able to know where your head is a bit better.

FWIW, no-one has ever argued that CO2 levels is the only factor effecting climate.