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His monotheism left no place for apparent polytheism. We know that a fundamental Hindu teaching is that God is one: Truth is One; sages call it by many names such as Indra, Mitra, Varuna, Yama, Garutman, or Matarishvan. (Rig Veda: 1:164:46) The Yajur Veda, another important scripture, expresses the same truth as follows: For an awakened soul, Indra, Varuna, Agni, Yama, Aditya, Chandra – all these names represent only One spiritual being. (32:1) These words lie at the heart of the religion but for many devotees and non-Hindu observers the reality seems to be polytheistic. The pictures and images which may be seen in a mandir, ranging from Rama and Hanuman, to Jesus, the Virgin Mary, Guru Nanak and Gandhi, might convey this message to the uninformed, rather than one of diversity within unity which is at the heart of Hinduism. Certainly that seems to have been true of the village Hinduism that Guru Nanak experienced.
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W. Owen Cole (Sikhism - An Introduction: Teach Yourself)