No, you're the one misunderstanding the physics. The reflected radiation is in a different spectrum than greenhouse gas absorption spectrum. The greenhouse effect is supposed to be about the difference in thermal radiation absorption frequencies, not sunlight absorption frequencies. You can read again about greenhouse effect to see that you misunderstood it. CO2 is the same as air in sunlight spectrum, which is the reflected radiation. Both are negligible. The entire argument rests on thermal radiation absorption, not sunlight absorption.
Do you have any background in physics at all? Seems like you don't really understand physics.
Here, wikipedia's entry:
https://en.m.wikipedia.org/wiki/Greenhouse_effect
The warm surface emits thermal radiation in IR, which is what is absorbed by greenhouse gases.
That's not your fault, their explanation is extremely misleading, like I have said.
