"You believe that there is only one God. You do well. Even the demons believe and tremble!" James 2:19

Jesus said "Get thee behind me, Satan; for it is written. Thou shalt worship the Lord thy God , and Him only shalt thou serve." Luke 4:8 

In ancient, Israel God's people recited the "Schema' ". Today their descendants still repeat the truth about God.

"Hear, O Israel: The LORD (Yhovah) our God (elohiym) is one LORD (Yhovah)"  Deuteronomy 6:4 (Translated from the original Hebrew)

What did Joseph Smith claim to restore? He claimed to restore the gospel of the God of Israel.

LDS worship Elohim, not Jehovah/Jesus.

The Children of Israel (Jews) worship the one God, Jehovah.

Christians worship the one God, Jehovah/Jesus (Jesus the Messiah was God manifested in the flesh)

Are the LDS worshipping a group of gods, or what they believe to be the Father of Christ?

If Jesus and the Jews recognize their Father God (Abba) as Jehovah, why don't the LDS? How is that a restoration?

"Know therefore this day, and consider it in thine heart, that the Lord he is God [Yahweh (Jehovah] he is Elohim] in heaven above, and upon the earth beneath: there is none else" Deuteronomy 4:39

The verses in Isaiah are particularly powerful because the Dead Sea Scrolls contain the Book of Isaiah, which we know has not been corrupted after the time of Christ. It has been preserved word for word, letter for letter as we have it today.                                                                                                 
"To whom will ye liken me, and make me equal, and compare me, that we may be like? Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me." Isaiah 46:5, 9 

Never compare God to man! There is none like Him! No other Gods, nobody.

"I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me: Tell ye, and bring them near; yea, let them take counsel together: who hath declared this from ancient time? who hath told it from that time? have not I the LORD? and there is no God else beside me; a just God and a Saviour; there is none beside me. Look unto me, and be ye saved, all the ends of the earth: for I am God, and there is none else." Isaiah 45:5, 21, 22

"Ye are my witnesses, saith the LORD and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. I, even I, am the LORD; and beside me there is no saviour." Isaiah 43:10-11

There are no other Gods. You will never be a God. He could not have been clearer.

"I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty." Rev 1:8

“I and my Father are one.” John 10:30   

“In the beginning was the Word, and the Word was with God, and the Word was God. “John 1:1

What does BEGINNING and END mean? Jesus is not part of a long line of Gods. He's not part of a "council of Gods.

"Thus saith the Lord [Yahweh], thy redeemer, and he that formed thee from the womb, I am the Lord [Yahweh] that maketh all things; that stretcheth forth the heavens alone; that spreadeth abroad the earth by myself" Isaiah 44:24

No one helped Him form the earth; not Adam/Michael, not Abraham, not Joseph Smith.
 

"Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ. For in him dwelleth all the fulness of the Godhead bodily. And ye are complete in him, which is the head of all principality and power:" Col 2:8-10

Jehovah-Jesus is God. In Christ DWELLETH ALL the FULNESS of the GODHEAD BODILY. All the fulness of the Godhead dwells in Christ. That's a lot to wrap your head around but it couldn't be plainer. Heavenly Father doesn't have a body. Heavenly Father is Jehovah. Jehovah, Jesus Christ, and the Holy Spirit are one God. God (Jehovah) spoke to us in the Old Testament. Jesus Christ, is God incarnate.

And without controversy great is the mystery of godliness:

God was manifest in the flesh,

justified in the Spirit,

seen of angels,

preached unto the Gentiles,

believed on in the world,

received up into glory.

1 Timothy 3:16