Deism at it's core is the idea that God exists and can be proven by logic, and one need not rely on revelation for knowledge of God.
https://en.wikipedia.org/wiki/Deism
For deists, human beings can know God only via reason and the observation of nature, but not by revelation or by supernatural manifestations (such as miracles) – phenomena which deists regard with caution if not
skepticism. Deism is related to
naturalism because it credits the formation of life and the universe to a higher power, using only natural processes. Deism may also include a spiritual element, involving experiences of God and nature.
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Too many men of letters of the time agree about the essential nature of English deism for modern scholars to ignore the simple fact that what sets the Deists apart from even their most
latitudinarian Christian contemporaries is their desire to lay aside scriptural revelation as rationally incomprehensible, and thus useless, or even detrimental, to human society and to religion. While there may possibly be exceptions, ... most Deists, especially as the eighteenth century wears on, agree that revealed Scripture is nothing but a joke or "well-invented flam."