No-where-man said:
What am I asking,is it possible to prove God's non-existence by logic or any other way?
First, I am not qualified to contribute to this thread, but I am following it with interest. I was wondering if. perhaps, it might help atheists to respond if you made a little more clear what you mean by "prove."
If you mean "prove with absolute certainty for every person who has every lived or who will ever be born" then, of course, you have set an impossible task. There are people who reject that Apollo missions landed on the moon, that appropriate blood transfusions make sense, and on and on.
If you mean "prove to you, personally" it may be that others do not know enough about you, and what you have already studied, to assist as fully as possible. If you are looking for help in discussions with acquaintances who are believers, it is probably better to refer them to some thousands of years of philosophical investigations on the nature of proof, reality, knowledge, God, soul, the nature of man, and so forth. There is no need to re-invent the wheel. If, in fact, this is the motivation behind your inquiry, then C1ay's resonse is the most lucid and cogent.
If you mean "prove as we believe certain scientific theories, such as Relativity, Evolution, Genetics, etc., to be 'proved'" it would first be better to ensure we all know what we mean by these theorems are proved. We run into the same problems here as we do in the prior three paragraphs.
However, if you mean "there is this idea, and it appears consistent with what we observe, and we do not have enough meaningful, contrary observations to deny the idea, and the idea exlains a lot of other things we can observe, and the idea correlates to other branches of knowledge as well, and the ideas further development is consistent with itself" then it is possible others can assist.
There is a difficulty, well-discussed in all manner of philosophy, religion, etc. It is much harder--in fact, almost impossible--to prove a negative than a positive. Consequently, by the very nature of proof, it would, from the start, be harder to disprove the existence of God than to prove God's existence. It is our nature to work with what is, most of the time, and not with the absence of what is. We commonly discuss how many lumens are given by a light source. We do not, typically, discuss how many "darkens" are given by a non-light source. It seems to have to do with both the nature of people and with the relative "easiness" of examing what is.
Given that this thread is predicated, then, on the admittedly harder flip side of the coin, I watch with interest. So far, while some specifics of the religiosity experience have been discussed, there has not yet developed a broad basis for proof according to the way scientific proofs are established.