If you are cold, you cover yourself with a blanket. The blanket raises the temperature of the air around your warm body. The blanket is not a heat source. The blanket does not raise the temperature of the air above your body temperature. The blanket simply makes it more difficult for your body heat to escape into the room. Greenhouse gases similarly make it more difficult for absorbed solar energy to escape the surface of the Earth, which pushes the temperature of the air near the surface up.
People who try to claim that greenhouse gases don’t exist, make skeptics look stupid and make it easy for others to ignore us. Don’t do that.