It is advantageous to read the 'REALITY CHEQ' article 1st, to get the most out of this section.
It is good to acknowledge our similarities to maximize positive relationship potentials, however, this does not negate that some differences are deceptive, misleading, harmful, even destructive. If it is only a little wrong, why not make it right … to avoid it becoming a bigger wrong.
God's Perspective ...
God, through Isaiah 42 ... 8I am the LORD (=JHWH = Yehowah (Jehovah) or Yahweh): that is my name: and my glory will I not give to another, neither my praise to graven images. ... 43 ... 10Ye 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. 11I, even I, am the LORD; and beside me there is no saviour. ... 44: 6 ... I am the first, and I am the last; and beside me there is no God. ... 8 ... Is there a God beside me? yea, there is no God; I know not any.
God, in Psalm 100 ... 3Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture. ... 5 ... his truth endureth to all generations (it is never outdated).
God, demands in ...
THE 10 COMMANDMENTS
... in Exodus 20: 1And God spake all these words, saying, 2I am the LORD thy God, which have brought thee out of the land of Egypt, out of the house of bondage. ...
God, in Psalm 96 ... 5For all the gods of the nations are idols: but the LORD made the heavens.
God, through the Apostle Paul in the New Testament:
1Corinthians 10: ... 14Wherefore, my dearly beloved, flee from idolatry. ... 19What say I then? that the idol is any thing, or that which is offered in sacrifice to idols is any thing? 20But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils. 21Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord’s table, and of the table of devils. 22Do we provoke the Lord to jealousy? are we stronger than he? 
A Primary Test: Does a lie become a truth because our ancestors taught it? ... or ... because we do not want to offend? ... offend anyone but God that is !!!
According to God ...
Some Common FALSE Demon Teachings ...
Muhammad > Koran > Islam > Muslims:
As a professing prophet of God, Muhammad proclaimed Jesus as a prophet/teacher of God, but denied Jesus being God’s son, declaring, God has no son. The scriptures; Old Testament prophets, New Testament apostles & Jesus witnessed, JESUS to be THE SON OF GOD & GOD; if not Jesus is a deceiver & false prophet. Muhammad thus promoted a conflict of interest oxymoron; advocating a false prophet or denying God’s manifestation of Himself.
As a supposed adherent of Moses, Muhammad proclaims God’s name as Allah, a name never used in reference to God by Moses or any of the scriptures. God through Moses & the scriptures consistently declare His name as JHVH in the Hebrew, generally pronounced as JEHOVAH in English.
Moses & all the scriptures declare that through Abraham’s son Isaac, would be THE PROMISE > Israel > THE MESSIAH = JESUS, not Ishmael. Muhammad is descendant of Ishmael.
The President of the USA, professing to be a Christian ... supposedly seeks advise from some of the most influential Christian leaders of the USA ... states that Islam is an honorable religion, contrary to God ??? Does 1+1=3
A USA Senator took an oath of office on the Koran ... in a country under God (Jehovah)? Does 2+2=3
Not all Mormon attendees fully know, but I have never failed to have an Elder of their society confirm all the following. They believe the God of the Bible is not the only God; He is only God of this universe; there are gods of other universes; eventually we can be gods of our own universes.
God has spirit wives in heaven by which He has spirit children; we were spirit children in heaven before we came to earth; Jesus & Satan were spirit children of God but Satan rebelled.
They subjugate interpreting the Bible under context of the book of Mormon, written by Joseph Smith in the 1820’s.
A Senator seeking the 2008 USA Presidency is a Mormon ... many Conservative Republican professing Christians say, that is fine? Does 2+2=5
Jehovah’s Witnesses wrongfully profess, Jesus the Son of God, is a created being, not eternal God; denying His deity. To know Jesus, is to know God & to know God is to know Jesus; this is the mystery of Godliness, dissipating the confusion about GOD’s PERSONAGE, opening the door to personal relationship with the TRUE GOD ... to know JESUS is to know HIM … to not know Jesus is to not know God.
Jehovah’s Witnesses also deny the Hell of eternal torment, spoken of by Jesus Himself.
 All Scriptures are from ... The King James Version, (Cambridge: Cambridge) 1769.