As God is The Ultimate Reality, the only way to say God doesn't exist is to adopt the position of nihilism.
If you could tell the difference between the created and the uncreated, you would understand that there is a certain level of absurdity involved in communicating God. We are, after all, created beings in the world of creation. Creation is our medium.
Archimandrite Sophrony was highlighting a great truth when he wrote "Throughout the ages the doctors of the Church sought ways and means whereby to communicate to the world their knowledge concerning Divine Being. In their attempts they constantly found themselves torn between unwillingness to abandon their imageless contemplation of the essentially one and only mystery, and the love which impelled them to communicate the mystery to their brethren."
With out the Holy Spirit, you will see images, but you won't really see what they are communicating. Or to use another example, it is like staring at the finger of someone who is pointing you to look at something.
The Ultimate Reality is God. The God we worship and acknowledge is The Truth.
That being understood, the flimsiness of all arguments against God is made manifest, and these spaghetti monsters, invisible pink unicorns, and what have you are also exposed for what they are. They are the products of a reasoning mind that is superstitious concerning God. And so, the very superstition that is mocked in these satirical mockings of God is revealed to be the very superstition the mockers themselves have concerning God.
And this is a topic about free will, not the existence of God. It should be clear that whether or not the cogency of evidence compels one into acceptance of the truth of free will, it cannot be said that there is no evidence. After all, if one says there is no evidence, they are in denial of the fact that they had to ignore their perception of making the choice to make such an obviously false assertion.