There is no proof that God exists

I thank Rational_Thinker9119 for his opening round. This is the first debate I have taken part in, on Debate.org or any site similar. I just wanted to point this out in advance incase I miss any normal debating etiquette and say that it is not meant.I would like to comment first on the contradictions of a "maximally great being" as has been put forward, after which I will deal with the Modal Ontological Argument put forward.To BeginPremise 1 asserts that "It is possible that a maximally great being exists."because "There is nothing contradictory in the concept of God."If you are asserting that it IS possible, that in itself is a positive claim and you have a burden of proof that you must meet to prove it. At best, until proof is shown, we can only state that "We do not know whether it is possible or not.".I say this because we cannot take it that just anything is possible.For example,If I have in my hand a number of coins, and I tell you I will put an unknown number of them on the table, and you say its possible that I can put down 8 coins. This is false as I infact have 4 coins in my hand. You may have believed it to be possible, but it never was. When you gain better knowledge (e.g. by looking in my hand etc.) then the greater knowledge will tell you it was not ever possible. Until proven, it is simply an "I do not know whether it is possible or not."As stated in your opening round the God of the Christian Bible (since that's the one we are both speaking about) is omnipotent (all-powerful), omnipresent (in all places at the same time), omniscient (He knows everything), and omnibenevolent (He only does things that are all good). My reasons for rejecting both parts of premise one are as follows.I reject premise one, and think that there are indeed contradictions within the concept of the God in which we are talking about.OmnipotentPremise 1 states that he is Omnipotent. This is backed up in the Bible"With God, all things are possible.". However the bible then contradicts this withinJudges 1:19: "And the Lord was with Judah; and he drave out the inhabitants of the mountain; but could not drive out the inhabitants of the valley, because they had chariots of iron." An all powerful god cannot triumph over Iron?It also contradicts with Proverbs 30:5, saying that God cannot lie, even though he can do anything. And in 2 Thess. 2:11 "for this cause God shall send them a strong delusion, that they should believe a lie."Does he lie? Or doesn't he? Can he? Or can't he?Can God destroy the Devil? Or take away original sin? Or remove the tree from the garden of evil? If he can, then why hasn't he? It would save alot of people from sin and would back up his Omnibenevolence. But he does not, or cannot.Epicurus posed the following problem in the Second Century BCEEither God wants to abolish evil, and cannot.Or he can, but does not want to.Or he cannot, and does not want to.If he wants to, but cannot, he is impotent.If he can, but does not want to, then he is wicked.If he neither can, nor wants to, he is both powerless and wicked.OmnipresentPremise 1 also states that God would be Omnipresent, yet in Deuteronomy 23:12-14,God walks. Walking requires moving from one place where you are, to another which you are not, otherwise you would already be there.A god who is everywhere, should not have to walk from one place to another.The same is true in Genesis 3:8-10 when God walks through the Garden, from one place to another (even though he is already everywhere). And Adam and Eve hide (even though he is everywhere), and God asks where they are (even though he is everywhere).If God is omnipresent, he would not have to walk anywhere. The same for if he is omnipotent. If he was omniscient he would not have had to ask their whereabouts.Lets also look at Exodus 33:20-23.God says not to look at his face, and that you will die if you look at gods face (even though it later states people saw his face and lived). This implies physical presence of body parts which a god who is everywhere has chosen to show there, at that exact time and place. To kill anyone who looks at his face, which he has chosen to show them, and knows in advancewho would see them, and how it would affect their life, would be preconceived murder, and goes against Gods Omnibenevolence. Even if we say it is free will to look or not,God knows your choice in advance, and there for still decides to confront you with a choice which he knows will resultin your death.OmniscientAs stated, God cannot lie, nor can he change his mind, for he knows everything.But the bible is full of instances where God either lies or changes his mind. In Exodus 32:14. After the incident when God's Chosen People worshipped the Golden Calf, God decided that He would destroy them all, and raise up some other nation, but Moses begged and pleaded on their behalf, and God repented of the evil which he thought to do unto his people. If God knows all things, past and present, including his own future decisions, did He really intend to destroy the Israelites? Or did he just bear false witness?In Jonah 3:10 ". . . and God repented of the evil, that he had said that he would do unto them; and he did it not." If He "did it not", then He knew from the beginning that He would not do it, and if He told someone that He was going to do it, then He was lying.The same could be said true of the contradictions with Genesis and the Great Flood. When he first created man he saw that it was good. He saw this knowing everything that was, is and ever would be, for he is God. But by the time of the great flood, he had changed his mind about humanity and saw fit to wipe most of it from the face of the earth. Was he wrong during Genesis? and not all knowing?Or did he know, and was not fussed that he would one day have to massacre most of the planet? And lied that what he created was good.A Maximally Great BeingIs God powerful enough to create something that He Himself cannot understand? If yes, then he is not all-knowing. If no, then he is not all-powerful. God, as described as both all-knowing and all-powerful, is a contradictory entity and cannot exist. Therefore, Premise one that it is possible, is false.- - - - - - - - - -The Modal Ontological ArgumentMoving on to the logical argument proposed. I could say the following;We'll call this the great fire breathing evil daemon.P1: "It is possible that a maximally evil being exists."This being would be omnipotent, omniscient and wholly evil in nature.P2: "If it is possible that a maximally evil being exists, then a maximally evil being exists in some possible world."Following your modal logic from the opening round.P3: "If a maximally great being exists in some possible world, then it exists in every possible world."It would be more evil for the being to exist in more worlds, therefore, a maximally great being would exist in all worlds.P4: "If a maximally great being exists in every possible world, then it exists in the actual world."By your own logic, it must exist in every world, and by extension, necessarily exist in our actual world.You cannot have 2 omnipotent, omnipresent etc. Beings. But this logic can easily back up both and there for contradicts itself logically.ConclusionIn conclusion, I have shown that an omnipotent, omnipresent etc. God cannot exist, refuting premise 1.This is backed up by the characteristics contradicting each other to the core, and furthermore in terms of a Christian god by way of what is said in the Bible.On top of that, even if we can agree that premise one was possible, your modal ontological argument gives for multiple greatest beings, which cannot happen. This proves the logical argument is flawed and therefore not proof that god does exist.