Actually Buddhism, strictly speaking, is a metaphysical system (not a religion) that excludes the existence of "God" as generally understood. In pure Buddhist thought Brahman is not God, he is simply the most enlightened being. In fact, according to Buddhist Metaphysics Brahman is actually the first being to fall from Nirvana, he thereby achieves self awareness and when other being fall and rejoin him on the lower run of existence he believes he created them. When other being fall still further they look up to the more enlightened Brahman and call him "God".
To be sure, there are people who hold beliefs similar to Buddhist metaphysics who DO believe in God as we in the West understand Him but they are a later splinter sect who re-incorporated elements of Hinduism into the religion. There are also "Buddhist Christians", which is really bizarre.
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