Sri Aurobindo translates Shwetashwatara Upanishad, Chapter Six, Verses 8-9: “God needeth not to do anything neither hath He any organ of doing; there is none greater than He nor do we see any that is His equal — for His power is far over all, only men hear of it under a thousand names and various fashions. (Or, He hath nought that He must do nor any organ if His doing; there is none like Him seen nor any greater. His might is over all and we hear of it in diverse fashions.) Lo, the strength of Him and the works of Him and His Knowledge, they are self-efficient and their own cause and nature. He hath no master in this world, there is none that shall rule over Him. Nor feature nor distinction hath He; for He is begetting cause and sovran over the lords of these natural organs, but Himself hath no begetter neither any sovran. (Or, but there is none that is His father or His sovran.)”
There are not a multitude of supreme Gods. There is ONE who manifests in all aspects of the creation. We tend to focus on one aspect or another and thereby laud a particular name or form of God. In all instances, we are however referring to that One in a particular finite aspect.
The Supreme is not limited to any specific name, form or type of action. There is nothing that the Supreme “must do” and at the same time, nothing that the Supreme must refrain from doing. Unlimited, unbound, unconstrained — these are what the Upanishads mean when they say “not this, not that”. This does not mean the Supreme is not manifesting in these specific forms, but that He is not limited by them. The Supreme is truly “One without a second” and one can realistically say “All this is the Brahman.” There is no contradiction if we understand the intent of encompassing, embodying and containing, but not thereby limiting either the infinity or the eternity, or the transcendent nature of God.
In whatever form we search for God, we find him. Yet we are called upon to recognize that whatever the path one follows, the goal is the same, the One, the Eternal and the Infinite, the Transcendent who also constitutes the Universal and the Individual aspects of existence.
Sri Aurobindo, The Upanishads, Shwetashwatara Upanishad, pp.369-384