Mormonism's Origins and Hypocrisy

Cults and sects often accuse orthodox Christians of deriving our doctrines, such as the trinity, from Greek philosophy. They never actually mention a particular Greek philosopher who taught the doctrine. Nor do they ever disprove the biblical justification for the doctrine. It's just an assertion that they constantly repeat, without actually checking the facts.

Mormons are one of the groups in particular that do this.

The reason I mention them specifically is that one of their own websites mentions -brags to be more explicit- that one of their cardinal doctrines, the preexistence of souls, comes from Plato: "Several philosophers from Plato through Leibniz and Kant to twentieth-century Cambridge intellectuals, dozens of poets from antiquity to Robert Frost, and numerous religious thinkers throughout the Jewish and Christian traditions, propounded a pre-earthly realm peopled by the souls of men and women yet unborn. Pre-existence has been invoked to explain 'the better angels of our nature,' including the human yearning for transcendence and the sublime; it suggests a reason for the frequent sensation of alienation and the indelible sadness of human existence" (https://ldsmag.com/article-1-408).

Do you see the hypocrisy?

This has been my consistent experience with Mormons. They make unsubstantiated accusations against Christians, while blanking out even the professed sources of their own religion.