Do you have any formal knowledge of what traditional forms of Buddhism teach? Because this assertion is divorced from what is actually contained in Buddhism. There is a duality, there is an evil one, and contrary to popular American conception, contains a panoply of divine beings and assertions concerning the moral nature of the universe. The following are not isolated instances, but are spread all over the Pali Canon.
The Pali Canon, SN 35:189 (tr. Thanissaro Bhikkhu)^2:
>There are forms, monks, cognizable via the eye—agreeable, pleasing, charming, endearing, enticing, linked to sensual desire. If a monk relishes them, welcomes them, & remains fastened to them, he is said to be a monk who has swallowed Māra’s hook, who has fallen into misfortune & disaster. The Evil One can do with him as he will.
>“There are sounds cognizable via the ear…
>“There are aromas cognizable via the nose…
>“There are flavors cognizable via the tongue…
>“There are tactile sensations cognizable via the body…
>“There are ideas cognizable via the intellect—agreeable, pleasing, charming, endearing, enticing, linked to sensual desire. If a monk relishes them, welcomes them, & remains fastened to them, he is said to be a monk who has swallowed Māra’s hook, who has fallen into misfortune & disaster. The Evil One can do with him as he will.
Similarly with gentle persuasion.
Pali Canon, MN 20 (tr. Thanissaro Bhikkhu)^2:
>If evil, unskillful thoughts—connected with desire, aversion or delusion—still arise in the monk while he is attending to the relaxing of thought-fabrication with regard to those thoughts, then—with his teeth clenched and his tongue pressed against the roof of his mouth—he should beat down, constrain, and crush his mind with his awareness. As—with his teeth clenched and his tongue pressed against the roof of his mouth—he is beating down, constraining, and crushing his mind with his awareness, those evil, unskillful thoughts are abandoned and subside. With their abandoning, he steadies his mind right within, settles it, unifies it, and concentrates it. Just as a strong man, seizing a weaker man by the head or the throat or the shoulders, would beat him down, constrain, and crush him; in the same way, if evil, unskillful thoughts—connected with desire, aversion or delusion—still arise in the monk while he is attending to the relaxing of thought-fabrication with regard to those thoughts, then—with his teeth clenched and his tongue pressed against the roof of his mouth—he should beat down, constrain, and crush his mind with his awareness. As—with his teeth clenched and his tongue pressed against the roof of his mouth—he is beating down, constraining, and crushing his mind with his awareness, those evil, unskillful thoughts are abandoned and subside. With their abandoning, he steadies his mind right within, settles it, unifies it, and concentrates it.
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1 - https://www.dhammatalks.org/suttas/SN/SN35_189.html
2 - https://www.dhammatalks.org/suttas/MN/MN20.html