God exists, as we can "know" it through faith, one of the "ways of knowledge".
The TOK textbook I use at my school outlines "faith" as "knowing without proof".
Faith extends material world and is a different form of WOK, which explains how it can be understood without "proofs" and "evidences" that we'd need for anything that happens predictably.
Existence of God has never been falsified. A theory not falsified is considered valid.
I believe God exists. There have been many times in my life where "impossible" things happened. If we rely 100% on what we know from our experiences and logics, how can we explain such "unexplainable" and "impossible" things? What about perfect coincidences that makes everything work out perfectly?
There is obviously someone behind all this. God controls everything.
Not everything will work the way we wanted. If God would listen to ALL OUR PRAYERS, He wouldn't be God. That way we'd be the god and He'd be like a genie.
We can ask for whatever we want. But it's up to God whether He'll let it happen, just as it's up to our parents whether they want to buy us something we want etc.
The main difference between God and a human parent, though, is the fact that God knows the future (in fact I believe he plans it too!) so he won't make any mistakes that a human parent would make.
If God exists, why would He let all the war conflicts and other horrible things to happen? Well, light cannot be seen, appreciated, or even exist without darkness.
I think God exists. This is what I think. You don't have to agree with me, but this is what I believe to be true.