Did Jacob really fight with God and prevail?

The Bible verses you are referring to are found in Genesis 32:24-26 and 29.

"And Jacob was left alone; and there wrestled a man with him until the breaking of the day. And when he saw that he prevailed not against him, he touched the hollow of his thigh; and the hollow of Jacob's thigh was out of joint, as he wrestled with him. And he said, Let me go, for the day breaks. And he said, I will not let thee go, except thou bless me. …And he blessed him there."

From the previous scriptures we learn Jacob earnestly prayed to God showing his deep reverence for God, his own humility, his request for help and his belief in His promises. Genesis 32:9-12 "And Jacob said, O God of my father Abraham, and God of my father Isaac, the LORD which said to me, Return to your country, and to your  kindred, and I will deal well with you: I am not worthy of the least of all the mercies, and of all the truth, which You have showed unto your servant; for with my staff I passed over this Jordan; and now I am become two bands. Deliver me, I pray Thee from the hand of my brother, from the hand of Esau: for I fear him, lest he will come and smite me, and the mother with the children. And Thou said, I will surely do you good, and make your seed as the sand of the sea, which cannot be numbered for multitude."

Jacob earnestly prayed. Apparently an angel of the Lord appeared to him in human form with some communication respecting his prayers and his fears. In his desire to have the divine blessing Jacob laid personal hold upon the angel, urging a blessing–Jacob's experience here reminds us of Jesus' experiences in the Garden of Gethsemane, when he wrestled with strong cryings and tears.  Luke 22:41-43 "And he was withdrawn from them about a stone's cast, and kneeled down, and prayed, Saying, Father, if Thou be willing, remove this cup from me: nevertheless not my will, but Thine be done. And there appeared an angel unto him from heaven, strengthening him." Our Lord agonized for long hours and finally got the blessing. And so it was also in Jacob's case: he urged, he pleaded, he wrestled with the Lord for the thing which he knew the Lord had promised.

Are angels holy creatures?

Angels are not necessarily holy nor unholy. The word angel in the Bible comes from the Hebrew word “mal’ak” or the Greek word “aggelos,” both meaning “messenger.” Angel can refer to human messengers such as in Matthew 11:7-10 which quotes Malachi 3:1, “…I will send my messenger [angel] ahead of you, who will prepare your way before you.” In this instance angel refers to John the Baptist. The word angel, however, is often interpreted as a spirit being, which could be holy or unholy. Some well known angels are Gabriel, Michael, and Lucifer.

In the Bible, Holy is the Hebrew word “Qodesh” or the Greek word “Hagios.” Old Testament usage of the word holy may be applied to things. For example, the Tabernacle and its furnishings were holy: “the holy altar” (Ex 29:37), “the holy anointing oil” (Ex 30:25), “the holy high priest's garments” (Ex 31:10), etc. In other contexts, holy describes “the holy sabbath day of rest” (Ex 35:2). Holy may also be applied to people, such as in 1 Peter 1:15-16 which quotes Leviticus 11:44-45, “You also be holy in all your conduct.”

A practical definition of holy is something that is set aside; special; for God; dedicated to God. God himself is Holy (Leviticus 11:44-45).

Thus, angels that are set aside to do God’s work would be considered holy (Matthew 25:31), such as Gabriel or Michael. Others, however, such as Satan (Lucifer) and the fallen angels (Jude 1:6, 2 Peter 2:4), would be considered unholy.

Explain about NIMROD. Is he the antiChrist, the son of Satan?

Nimrod is an Old Testament personage from Genesis 10:8 “Now Cush (the son of Ham) became the father of Nimrod; he became a mighty one on the earth.”

He was the great grandson of Noah and would have had first-hand knowledge from his parents about the Lord. He had also been told how God saved Noah and his family from the flood and from the fallen angels who populated the earth before the flood.  As a close descendant of Noah, one can imagine that he was highly respected. He is credited in Genesis 10:10-12 with building many cities including the Tower of Babel in Babylon.

As the ruler of the city, Nimrod must have been influential in the building of this structure. A tall tower could have served as a high shelter to save people from another flood. Therefore, the tower was a rejection of God’s promise that there would be no more floods to destroy the earth.  It was also an example of great pride that people could escape God’s judgments by creating a tall refuge.

This displeased the Lord and in Genesis 11:5-8, the Lord mixes the languages and the people scattered to different places in the Earth: “The LORD came down to see the city and the tower which the sons of men had built. The LORD said, Behold, they are one people, and they all have the same language. And this is what they began to do, and now nothing which they purpose to do will be impossible for them.  Come, let us go down and there confuse their language, so that they will not understand one another's speech.  So the LORD scattered them abroad from there over the face of the whole earth; and they stopped building the city.  Therefore its name was called Babel, because there the LORD confused the language of the whole earth; and from there the LORD scattered them abroad over the face of the whole earth.”

In addition to this, there are many archeological artifacts which illustrate that Nimrod was involved with the introduction of many evil pagan worship practices and pagan doctrines. An interesting book along this line is The Two Babylons by Rev. Alexander Hislop. The author traces various Christian beliefs back to their evil inception in Babylon. However, evil as Nimrod was, he was a mere man – not the AntiChrist nor the son of Satan.