We’re not even for sure how many dimensions there are, much less what’s in them or how to get to them. Till we have the power to explore everything there is, there’s no way to disprove God.
Not necessarily. Examine this from Proof #17 from the site:
"Imagine that we have a conversation one day and I say to you, "I believe in the gerflagenflopple. You cannot prove that the gerflagenflopple does not exist, therefore it exists." You can see that this is ridiculous. Just because I have invented something out of thin air does not mean that its non-existence is suddenly unprovable. There has to be some evidence that the gerflagenflopple exists in order to assert its existence. Since there is not, it is quite easy to say that the gerflagenflopple is imaginary."
What this site tries to do is to disprove the things that religious people use to assert that there is a supreme being. Those things are tangible enough to be able to analyze.
While it is true that either God's or a gerflangenflopple's existence cannot be completely disproved, we can certainly look at the reasons, if any, that someone would believe in the existence of either.