The practice of monotheism is one that best fits the belief in only one god and serves a basis for Islam and Christianity.
What is monotheism?
This is a religious practice that holds the belief in the existence of one god.
Some examples of religion that practiced monotheism includes Judaism, Christianity and Islam.
Therefore, the word "belief in only one god" and "basis for Islam and Christianity" is best described by practice of monotheism.
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