Madhwa, Buddhism doesn't lack spirituality. To a certain degree all religions have some degree of spirituality in them since religion is man's response to spiritual needs, the fear of the unknown, need for security and inability to figure out the mysterious world. When Hinduism got infected with too much karma kanda and started worrying about the nature of the God rather than the behavior of the humans, Buddhism was the answer. The basic essence of Buddhism is to correct our personal behavior rather than interpret the God's behavior. As per Buddha, we are wasting too much time in trying to know the true nature of God rather than improving our own behavior and critically evaluating our own nature. Hinduism has great amounts of spirituality derived from the tribal religions that it encompassed, Buddhism was arrived at after scientific and rational thinking hence it might appear to have less spirituality as compared to Hinduism. In fact, Rajneesh called Buddhism the most scientific religion. Same is true with Jainism. As per Jainism, the universe was created in a sub second out of nothing and is billions of years old (only religion in the world to say so). Also, do you know that most of the nuclear scientists in the world are Buddhist? Scholars have even translated lotus sutra into English so that modern physicists when they face the unknown, mysterious universe can learn from the thinking of the ancient masters and why we are here. Not everybody likes scientific thinking
