Why disbelievers believe? They believe in so called “God of the gaps”.

[FatAndFaithless]

You're right. There's nothing wrong with gaps in knowledge, and it's both more honest and more responsible to say "I don't know" when confronted with one of these gaps.  But that's not what happens with many theists.  You present a gap in our knowledge - the origins of the universe for example - and instead of saying "I don't know" the response you receive is "God is the reason."

In some circumstances I would agree with this example, in others; I would not. It all depends on the reason for the conclusion.   Also, inserting X into the gap, doesn't mean that it is incorrect, just ill-founded.

Well obviously.  I'd say unfounded rather than ill-founded.  Inserting X into a gap tells us exactly nothing about whether its likely true or not.  The insertion of X into a gap should come after the justification for it.

That sounded far dirtier than I  meant it to.