The ONENESS of God as seen in Christianity and Islam, the sources are mainly the Bible, and Quran.
Tries to Worship Human Beings
"In Lystra there sat a man crippled in his feet, who was lame from birth and had never walked. He listen to Paul as he was speaking. Paul looked directly at him, saw that he had faith to be healed and called out, "Stand up on your feet!" at that, the man jumped up and began to walk. When the crowd saw what Paul had done, they shouted in the Lycaonian language, "The gods have come down to us in human form!" Barnabas they called Zeus, and Paul they called Hermes because he was the chief speaker."
"They take their priests and their anchorites to be their lords in derogation of Allah, and (they take as their Lord) Christ the son of Mary; yet they were commanded to worship but One God (Allah): there is no god but He. Praise and glory to Him: (far is He) from having the partners they associate (with Him)."
"Do not let anyone who delights in false humility and the worship of angels disqualify you for the prize."
"Nor would he instruct you to take angels and prophets for Lords and Patrons. What! would he bid you to unbelief after you have bowed your will (to Allah in Islam)?"
"One Day He will gather them all together, and say to the angels, "Was it you that these men used to worship?"
Worshipping Other Gods
"So Jacob said to his household and to all who were with him, "Get rid of the foreign gods you have with you, and purify yourselves and change your clothes."
"Were you witnesses when Death appeared before Jacob? Behold, he said to his sons: "What will you worship after me?" They said: "We shall worship your God (Allah) and the God (Allah) of your fathers,- of Abraham, Isma'il (Ishmael), and Isaac, - the One (True) God (Allah): to Him we bow (in Islam)."
(One of the Commandments) "You shall not have no other gods before me."
"Serve Allah (God), and join not any partners with Him"...
"Remember the former things, those of long ago; I am God, and there is no other; I am God, and there is none like me."
..."there is nothing whatever like unto Him, and He is the One that hears and sees (all things)."
No Part from Him
"I am the Lord, and there is no other; apart from me there is no God."
"Say: He is Allah, the One and Only...He begets not, nor is He begotten"...
He is Present Everywhere
"Where can I go from your Spirit: Where can I flee from your presence? If I go up to the heavens, you are there; if I settle on the far side of the sea, even there your hand will guide me, your right hand will hold me fast. If I say, "Surely the darkness will hide me and the light become night around me," even the darkness will not be dark to you; the night will shine like the day for darkness is as light to you."
"Don't you see that Allah (God) knows (all) that is in the between three, but He makes the fourth among them, - nor between five but He makes the sixth, -nor between fewer nor more, but He is in their midst, wheresoever they be; in the end He will tell them the truth of their conduct, on the Day of Judgment. For Allah has full knowledge of all things."
God is the Supreme King
"The Lord brings death and makes alive; he brings down to the grave and raises up. The Lord sends poverty and wealth; he humbles and he exalts. He raises the poor from the dust and lifts the needy from the ash heap; he seats them with princes and has them inherit a throne of honor. For the foundations of the earth are the Lord's; upon them he has set the world."
1 Samuel 2:6-8
"It is Allah (God) that gives (you) Want or Plenty, and to Him shall be your return."
..."Abraham said: "My Lord is He Who gives life and death"...
God Knows All Things
"And even the very hairs of your head are all numbered."
"He determines the number of the stars and calls them each by name. Great is our Lord and mighty in power his understanding has no limit."
..."and his understanding no one can fathom."
"Not one of the beings in the heavens and the earth but must come to (Allah) Most Gracious as a servant. He takes an account of them (all), and has numbered them (all) exactly.".
"Say: "Whether you hide what is in your hearts or reveal it, Allah knows it all: He knows what is in the heavens, and what is on earth. And Allah has power over all things."
God does not Slumber or Sleep
"He(God) will not let your foot slip- he who watches over you will not slumber; indeed, he who watches over Israel will neither slumber nor sleep."
"Allah! There is no god but He,-the Living, the Self-subsisting, Eternal. No slumber can seize Him nor sleep. His are all things in the heavens and on earth. Who is there can intercede in His presence except as He permitteth? He knoweth what (appeareth to His creatures as) before or after or behind them. Nor shall they compass aught of His knowledge except as He willeth. His Throne doth extend over the heavens and the earth, and He feeleth no fatigue in guarding and preserving them for He is the Most High, the Supreme (in glory)."
God is Just
"The fear of the Lord is pure, enduring forever. The ordinances of the Lord are sure and altogether righteous."
"There is no god but He: that is the witness of Allah, His angels, and those endued with knowledge, standing firm on justice. There is no god but He, the Exalted in Power, the Wise.".