Yeah and me! No offense to those people

.
It's simply that, following Logic, all things must have an origin. this origin in many agnostics systems is the creative energy or force. This is effectively the same force that Muslim's Christians, Hindu's and every other Theist follows. Agnostics are almost certainly always theists.
The point of departure many come from early on, in that not all agnostics will beleive that this force is sentinent or still in existance.
Just because something did exist dosnt mean it still does.
Further down the line is the consideration wether this force can interact with us humans on a speck of a planet on the speck of a solar system in a speck of a galaxy in the back end of the universe.
Assuming that it is sentinent, is still in existance and can communicate or at least at some point did communicate, then we have to ask, out of all the people who claimed to have had communed with it, who was in actuallity communing and who was simply mentally ill or manipulating people for power wealth and fame.
To figure out that, we have to look at the known histories, the known facts and tangible evidence. Without all these, I myself could simply claim I was in communion and if enough people were daft enough to beleive me, then hey presto...a new religion is born.
Religions tend to be self feeding. The longer they last, the more credibility they have, so they last even longer. Scientology is a example; as the decades roll by, it is turning from a science fiction authors powertrip into a sizable and even in this PC climate , respected religion. (you cant mock scientology, because thats disrespecting peoples beleifs...and they'll come and sue you in court, or intimidate you)
Regards