One Nation Under WHAT God?

What God are we worshipping? Is it enough to believe in just any “god”? Does the true God of the Bible accept our worship of pagan idols? Does He want us to worship Him as just one Person, or as three Persons in one Person, or as one Person in three hypostases or modes of being? Who and what IS God? Who was and is Jesus Christ? Are the Jews or the Moslems correct, who worship just one God Being, or orthodox Christians, who worship a Trinity, believing that the Holy Spirit is God? Or are they perhaps ALL wrong?