Synonyms may be pantheism, paganism, or henotheism.

Henotheism is the belief in and worship of a single primary god while recognizing the existence of other gods. Unlike monotheism, henotheism does not deny the existence of other deities but elevates one god above the rest in terms of importance or devotion. This belief system is often found in ancient religions such as Vedic Hinduism.

Henotheism is the belief in one God without denying the existence of other Gods.

Henotheism is the belief in one God without denying the existence of other Gods.

It's actually Henotheist and it means belief in or worship of one God without denying the existence of others. Greek heno- (from heis, hen-, one; see sem- in Indo-European roots) + Greek theos, god; see dhēs- in Indo-European roots + ism.