Not spirituality. Religion. Just as you wrote about how Alexander's father created a cult like religion to use to bind warriors together, that is why modern Christianity in the form of what we call Catholicism was created by Emperor Constantine.

For differences between religion and spirituality, you may read my https://medium.com/know-thyself-heal-thyself/spirituality-redefined-ff45cb53eaf2 which includes one of my favorite quotes: "Religion cannot stand Spirituality. It cannot abide it. For Spirituality may bring you to a different conclusion than a particular religion — and this no known religion can tolerate. Religion encourages you to explore the thoughts of others and accept them as your own. Spirituality invites you to toss away the thoughts of others and come up with your own."― Neale Donald Walsch, The Complete Conversations with God