求《哈利波特》中关于盖勒特.格林德沃的【圣徒】名称来源详解。

书中从来没提过盖勒特的追随者叫圣徒
他的追随者叫Gellert Grindelwald’ army
但是盖勒特痴迷于死亡圣器是真的，还用死亡圣器作为自己的标志，圣徒一词也确实出自死亡圣器就对了

老邓有提过盖勒特召集军队，也没说盖勒特的追随者叫圣徒↓

"While I busied myself with the training of young wizards, Grindelwald was raising an army."
—Albus Dumbledore

圣徒（believer）这个词是卢娜他爸提起来的
卢娜他爸提起死亡圣器时是这么说的↓

"That's right," said Xenophilius. "You haven't heard of them? I'm not surprised.

Very, very few wizards believe. Witness that knuckle-headed young man at your
brother's wedding," he nodded at Ron, "who attacked me for sporting the symbol of a well-known Dark wizard! Such ignorance. There is nothing Dark about the Hallows – at least not in that crude sense. One simply uses the symbol to reveal oneself to other believers, in the hope that they might help one with the Quest."
“是的，”谢诺菲留斯说，“你从来没听说过？我不奇怪。只有很少很少的巫师相信这些。记得在你哥哥婚礼上那个愣头小伙子，”他冲着罗恩点点头，“还抨击我戴着一位著名黑巫师的标志！真是愚昧。圣器一点也不‘黑’——至少不是在那种低级的意义上。人们只是用这个标志向别的圣徒展示自己，希望在探求途中得到帮助。”
……

……
……
"Well, you see, believers seek the Deathly Hallows," said Xenophilius, smacking
his lips in apparent appreciation of the Gurdyroot infusion.
“是这样，圣徒们寻找死亡圣器。”谢诺菲留斯说着咂了咂嘴，显然是表明戈迪根茶的滋味妙不可言。

你看，只要是相信死亡圣器的人都称作believer（圣徒），所以圣徒不是Gellert Grindelwald’ army的称呼，圣徒是一群相信死亡圣器存在的人。
只不过盖勒特狂热地痴迷于死亡圣器，想当"invincible Masters of Death"
所以由他集结的Gellert Grindelwald’ army也都相信死亡圣器的魔力，所以他们都是圣徒。。。

总而言之，就是圣徒不一定Gellert Grindelwald’ army，但Gellert Grindelwald’ army一定是圣徒。。。
但是久而久之，，，圣徒通常指的是Gellert Grindelwald’ army