Buddha himself taught different teachings to different people under different circumstances. For some people, there are beliefs based on a Creator. For others, no Creator. The only "definitive truth" for Buddhism is the absolute negation of any one truth as the Definitive Truth.
The nature of the mind is such that if certain mental qualities are developed on a sound basis, they not only remain, but they also increase. In fact, once properly developed, the mind's good qualities eventually increase indefinitely. Therefore spiritual practice brings us long-term happiness and inner strength.
As free human beings we can use our unique intelligence to try to understand ourselves and our world. But if we are prevented from using our creative potential, we are deprived of one of the basic characteristics of a human being.