While I respect it, this is merely your opinion, and my happy existence flies in the face of it.
It's a little more than an opinion. There is much that is immaterial that makes life worth living. Art, philosophy, literature, mathematics, logic, are just a few of the things which the material world knows nothing of and which are beyond it. To deny that there is something beyond what we can see, touch and feel is ludicrous. It is those very things which make us human. Materialists not only deny their own humanity but also everything that is good in life in order to arrogantly proclaim themselves free from a superior being.
Is your happiness based solely or mostly on material things?