This 'argument' for the existence of god(s) is hilarious. I love it when Jehova's Witnesses offer it as a deep thought challenge.
Therefore, there must be something that exists outside of time matter and space that began them ...
Your answer, presumably, is that the 'something' is god? OK, then, how did god begin?
God, you say has no beginning or end? So god is infinite?
Now we agree that infinity is a valid concept, right? Not everything has to have a beginning or end that we can understand (even if we're physicists). It's not unreasonable, then, to suppose space-time is infinite.
Maybe we're both talking about the same thing? God is space-time, just something that occurred for no known reason. A natural accident.
But god isn't an accident, it has intention, purpose, consciousness. Really, how did it acquire its purpose and intention? And why's it so interested in the details of human lives, when it's got the whole universe/itself to play with?
... We all have 'faith' in that we believe we are products of an ineffably vast process that's been going on forever, or for what we can only conceptualise as 'ever'. The difference is that some believe this process is a gigantic, conscious being that thinks like a human.
Me, I look at the findings from space telescopes and think wow, what a spectacularly explosive jumble of consequences. Fascinating!
I don't really see how any of you believe a human-thinking giant created all those massively exploding stars, black holes, gas clouds, etc. Why would such a being be so interested in whether Fred shagged his best mate's wife or some other bloke ate pork? If it can do all that stuff, would it choose to live in a big house made of gold and gemstones? Seems a bit pedestrian, given its options!
But, yeah, we all have faith of a sort.