Is not the supreme goal of Buddhism to become so enlightened that you achieve ones with the creator? Seem to me they do believe in God (creator)
It's far more like becoming one with the creation, rather than the creator. It's about being in the exact right space in the universe and having that frequency resound in you, more than it's about the worship of some entity. Buddha is a centerpiece, a focal point, but the larger point is that we can all become as Buddha ourselves, that we all have a Buddha nature that only we can fulfill.
"There is no absolute truth" - discuss
There are lots of absolute truths. Depends on the question which ones are valid. I know people in here (and elsewhere too) get real hung up on the binary, but just because thing A is 'good' does not make all that is not 'A' bad. One truth does not render all else false.
For example, I've always had a bit of difficulty classifying Buddhism due to it's non-theistic nature - it's very much philosophical, but at the same time there are mystic aspects to it. I guess it boils down to what you personally want to define as a religion vs a philosophy.
Well there are some pretty ironclad differences between what is a 'religion' and what constitutes a 'philosophy'. And in any of them, all of them in fact, Buddhism would be considered a religion, not just a philosophy. It has ritual, and a definite separation between the sacred and the profane - both very religious deals. But religion is not required to have a supernatural god, not at all. In fact pretty much only the newer Western ones have that omnipresent god thing as a constant and unending focal point. Confucianism doesn't have a one and was for a long time the most practiced religion in the world. That Confucianism was totally humanistic, totally lacking any supernatural divinity does not make it any less religious.* Simply put "having a god" is not a requirement for a religion. Look at Nazi Germany.
* - They are similar in most ways however, Confucianism is preaching: "Do not do unto others what you would not have them do unto you" centuries before Jesus was strolling about the Holy Land saying the same thing.