Recently I watched this video and that's where my question stems from. All native speakers of English in the video use the definite article the when referencing Buddha: The Buddha. But, His Holiness, the Dalai Lama talks about him as Buddha, not The Buddha.
I noticed that sometimes God, or Lord may take the definite article, not always, although there's only one God, but Jesus, Moses and Allah don't. I also know that the proper names don't take the definite article such as Frank, Jim. Susan, etc.
So, when does one employ a definite article with deities and holy people, please let me know your thoughts on this.