Taking this down to the most basic level which even the dumbest person couldn’t possibly misinterpret.
The sun warms the Earth’s surface, which causes the Earth’s surface to emit longwave radiation.
Greenhouse gases like H2O and CO2 absorb certain wavelengths of longwave radiation emitted from the Earth’s surface. This adds energy to those molecules, which gets transferred to nearby molecules as heat. Without the greenhouse gas molecules, that energy would have been directly transmitted back into space without warming the atmosphere.
Straw man arguments about things I didn’t say, are not welcome.