Can any atheist deny this certain proof that God exists?
That is an excellent and well thought out proof! It will be fun watching the atheists trying to find some way to squirm out of that one! But you know I think that God says ‘yes’ more often that we realize but just in a way we don’t always expect. Here is a true story: I once prayed that I would win the lottery but I didn’t and at first thought God had said ‘no’. BUT then a few days later, I was going to have my breakfast when I discovered that I was out of corn flakes so I went to the store to get some. And guess what – and this is actually true – the corn flakes were on offer two for the price of one so I scooped up a bunch of them and made money that way. At first I thought it was just luck but when I got back home and started thinking straight I finally realized the truth of matter – God had answered my prayer with big fat ‘yes’! So not only does God always answer your prayers but He says ‘yes’ more than we might think if only we take the trouble to look for evidence of His work. So
This is not a “certain proof” of the existence of God. This is your interpretation of events, in which you interpret whatever happens as the will of God. Whenever you want something to happen, there’s always a chance that it will happen and a chance that it won’t happen. This doesn’t mean that everything that happens is somehow a response from God to your prayer; you simply interpret it to be so.