It is true that there is no way to prove that a god does not exist, there is also no way to prove that he or she does exist. For each seperate living individual, the belief in the existance/non-existance of a god or gods may or may not be true. Every single person has (or dosn't have) personal spiritual experices when living life. However it is important to note that even if that one person truely one hundred percent believes and wants a god to exist (and all their personal experiences tell them they "know" there is a god) it does not mean that he/she/it actually does exist. It is self deception, nothing more.
Some people still believe the world is flat, or that man didn't land on the moon. But it dosn't make the facts any less true. The world is round and that Neil Armstrong and crew did land on the moon. These people and people like these people who disreguard scientific proof and reasoning are decieving themselves to believe in a reality, which they have created. Perhaps they feel more comfortable living in a world which is flat rather then round in shape. I don't know im not a phycology major.
As for the last argument for agnoticism being the most logical conclusion when disagreeing with religion i would say that with todays ever advancing modern technology as well as the advancements in the fields of biology, chemistry and physics human kind is constantly learning more and more about the world we live in. Things once only religion had an answer for are now being answered more logically and rationally by science. people are realizing that major aspects of religious books written thousands of years ago are largely incorrect. Perhaps people are asking themselves the question, "What else have we been lied to about? Reserections? Talking burning bushes? Thatens?". Agnotisism may, at the present time, seem like the most logical step. However I would argue that as time continues on and science advances atheism will seem like the most logical and rational conclusion. Just as back one thousand years ago the existance of a divine entity was the most rational conclusion when people looked at the world around them.