There is a possibility that God is not simply only one. It is because God is almighty. Yet, we seem to be required by God to believe that God is one.
The fact that God is almighty can stand with His request that the mankind believe specific things about Him.
Put simply, we are not so advanced to fully and soundly understand God and the meaning of His being almighty and perfect, which means we have to be humble before God. However, much money makes us blind to God and his almighty; so money is an enemy of God.
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Luk 4:10 For it is written, He shall give his angels charge over thee, to keep thee:
Luk 4:11 And in their hands they shall bear thee up, lest at any time thou dash thy foot against a stone.
Luk 4:12 And Jesus answering said unto him, It is said, Thou shalt not tempt the Lord thy God.