Buddhism is a religion. It has beliefs, rituals, altars, offerings, bells, candles, metaphysics, clergy, devotees, prayers, meditation, visions, visitations, celestial beings, other worlds, other lives, moral law, and salvation. All these are found in Zen Buddhism, in Theravada Buddhism, in Tibetan Buddhism, in Pureland Buddhism, in the other schools of Chinese and Vietnamese Buddhism, in fact, in all of Buddhism all over Asia. Buddhists probably burn more candles and incense than the Catholic Church. These are not degeneration or cultural accretions. The founder himself gave us robes, taught ritual and contrition, revealed other lives and worlds, and spoke with the gods. Secularised and rationalised variants of Buddhism exist, but it is these that are partial forms and cultural products of later derivation.
Sometimes it is said that Buddhism is scientific. This assertion would put Buddhism somehow within the frame of science, but Buddhism has much that would not fit into that frame. However, although we cannot really say that Buddhism is scientific, science is Buddhistic. Science is Buddhistic in that science is a way of knowing some things. Buddhism can accommodate everything that science perceives, but science can only perceive a fraction of what Buddhism encompasses, the fraction that appears within the frame that the restrictive rules of science impose. Distinct from science itself, there is also scientism, which is a modern philosophy. Scientism is not Buddhistic because it is the attempt to make the restrictive rules of science into the dogmas by which the whole of life should be governed. Scientism is a different religion and a rather narrow one and it would be a tragedy if Buddhism in the West were reduced to it.