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Belief in the existence of a god or gods, especially belief in a personal God as creator and ruler of the world.

the′ist n.
the·is′tic, the·is′ti·cal adj.
the·is′ti·cal·ly adv.
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Adj.1.theistical - of or relating to theism
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References in classic literature ?
Then he recited in English an Arya-Somaj prayer of a theistical nature, and stuffed his mouth with pan and betel.
One of several nicknames for Texas, Chili State transposes to theistical (Webster's Third & OED).
In view of vehement public rejection of atheism as a reprehensible attitude, the minister displays great tolerance by admitting: "it concerns us to know that, while Christian and most theistical writers lay the foundation of morals in the being of God [.