As a matter of fact, creationists CAN 'posit' theories also... the problem comes when they don't do as science does and test those theories in various ways.

Something posited but not examined is merely a belief or slogan.

However...in this case, Pete has referred to the only way 'positing' can be reasonably used in a religious way.
Since it is very difficult to even think about what happened before the "big bang"...or why there was 'something' to GO bang... it doesn't bother me if religious folk want to say "I just choose to think that God gave the universe a push...which some of you call a 'bang'." At that point, I can just shrug. I only get upset when scientific attempts to explain the physical universe and the age of stars & the Earth and human evolution are dismissed. If they want to say that "God planned it this way"...fine... but please don't deny what "this way" actually is!

Religion is one way of coping and expressing wonder and sharing comforting thoughts about life & death with others....and it is easy to see why humans developed religious feelings. It is hard, though, to see why they cling to demonstrably inaccurate ideas about science as we learn more.