I came across this interesting blog post and thought I would share it here because it relates to me as a practitioner and also the questions I myself ask. There are certain interesting points which I have highlighted. Please feel free to comment and expand on what was written below in order that we may continue to learn and absorb more!
"Why not just ask another Deity or Buddha to protect us?! I have been relying upon this Wisdom Buddha Dorje Shugden for 27 years and have felt every day his beneficial influence in my life. I'll try and give some context here to help the general reader.
According to Mahayana Buddhism there are countless Buddhas, or enlightened beings, because everyone (Buddhist or not) always has the potential to perfect their love, compassion and wisdom. The Wisdom Buddha Dorje Shugden is one Buddha among many. Some people trying to figure it out have asked me, "Why the fuss about this particular Buddha? Why not just give in to the Dalai Lama's wishes to stop the worship of this Buddha? Isn't all Buddhism the same?" This is equivalent to suggesting to a Franciscan that he stop making prayers to St. Francis. What may seem an obscure practice to others, including other Christians, is an essential part of others' faith.
But to understand the context, we can step back a moment to point out that Dorje Shugden practitioners are all Buddhists who rely on Buddha, Dharma (inner realizations of his teachings), and Sangha (the spiritual community). As Buddhists, we are dedicated to improving our inner qualities such as love, compassion and wisdom to find greater peace of mind and capacity to help others, culminating in the highest spiritual goal of enlightenment for the sake of all living beings. Along with that we are striving to overcome the so-called delusions in our mind, such as anger, greed, pride and ignorance, that cause our own and others' suffering. Lofty goals indeed! And that is where Dorje Shugden comes in. We need help if we are going to do this.
According to the Mahayana Buddhism of Tibet and elsewhere, Buddhas can appear in any form they choose -- they have mastered reality, the illusory nature of all phenomena, so they can do as they please! Some enlightened beings appear as teachers (in any tradition), some appear as Dharma Protectors, some appear as ordinary beings. Dorje Shugden is a Dharma Protector manifestation of the Wisdom Buddha Manjushri. He protects the Dharma of love, compassion and especially wisdom in our minds. His relatively wrathful aspect symbolizes his power to help us defeat the inner enemies of the delusions.
This tradition of prayer and worship is not a new thing. It is 400 years old. For 400 years Dorje Shugden practitioners have made peaceful prayers to this Buddha. For example:
“Now is the time to protect the pitiful and protectorless; Now is the time to protect Dharma practitioners as your children.”
This is an unbroken tradition of prayer that has been passed down to us through generations of highly accomplished Buddhist masters up to the present day. The Dalai Lama himself was a recipient of this tradition through his own masters, including the beloved Trijang Rinpoche, who taught him most of the Dharma he knows. Dorje Shugden is a Buddha and so his compassion protects all living beings, but his main job is to protect the realizations (inner spiritual experiences) of those who are sincerely trying to follow the tradition of Buddha Shakyamuni (500BC) as transmitted via the great Indian Buddhist master Atisha (982-1054AD) and the great Tibetan scholar and saint Je Tsongkhapa (1357-1419AD). This is called the Ganden, or Gelug, or Kadampa tradition.
Just as there are many paths up the mountain, so there have always been many Buddhist traditions, all dating back to Buddha Shakyamuni (500BC). Dorje Shugden practitioners are not claiming to have the best tradition, just the one that works best for us.