It is not atheistic, as some uninformed critics suggest. Buddha's principle subject was suffering and the end of suffering, not theological and ontological issues. All religions are similar in many ways, yet each has its different emphases. My own teacher Kalu Rinpoche used to answer this question by saying you do not need to convert. It is probably useful to hold your current beliefs up to examination, whatever they may be.
Investigation is said to be one of the most transformative agents facilitating enlightenment.
There is nothing to believe in Buddhism, and everything to discover. To transcend the self is to be enlightened by all things. I hear and read this word everywhere. Dharma is a Sanskrit word. It means teaching, truth, doctrine, spirituality, or reality.