It certainly cannot be proven.
- Prayer does not seem to work – Every religion touts worship and making offerings as being the most effective method of contacting its particular deity. However, it's clear even to children, that prayer rarely works if it indeed works at all. The handicapped are never cured; the blind never regain sight and loved ones aren't prevented from experiencing gruesome and painful deaths. If a core tenet of religion does not work as advertised, why believe in the rest of it?
- Moving goalposts – Every time religion conflicts the changes in a society, religion is simply altered to encompass those change. Even though religion claims to be a "fixed" source of morals and ethics, it has managed to ditch its former approvals of slavery, the divine right to rule held by kings/emperors, the infallibility of its clerics, its advocating of violent warfare to spread the faith and a host other positions it formerly. Since religion is an invention of human beings, it simply reflects the current attitudes and mores of the people who believe in it.
- Various religions – Presuming a god or gods to be omniscient beings, it's odd how he/she/it/they consistently fails to foresee how various individual beliefs will (and do ) simply cause confusion, anger and strife. If there were truly omnipotent gods, wouldn't their making humans worship a single deity be more efficient and certainly cause far less of the strife and warfare that can attribute their origins directly to religious beliefs?
- Miracles – Although far more people are alive now than in the past, the numerous “miraculous” events which are commonplace in religious texts do not appear to happen today. This is particularly troubling as today methods exist to document these acts with more than rumor, apocrypha and vague written accounts. If there are indeed divine beings why don’t they do today what their followers profess that they did in the past?
Sooo,,,in short…the existence of a god or gods, cannot be PROVEN even by its disciples meaning that there is no real need to DISPROVE it. If or when the devout can prove that their beliefs are indeed anything other than a philosophical outlook on life, then a debate can begin. Until then, there is nothing for myself and others who don’t share their beliefs to disprove.