And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years. There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown. And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually. — Genesis 6:1-5.
This brief passage tells a very important origin story. A group of the “sons of God”, the Biblical name for angels, in rebellion against The Lord, came to Earth and took human women as wives to have illicit relations. And their children, half-human, half-angelic hybrids, were the Nephilim giants. The idea of angels sleeping with women and having kids is not something that all Christians agree upon, know about or even comfortable with. However, the truth of Christianity is based upon one source: God’s Word as revealed in the Holy Bible. And from a study of Scripture it becomes clear that this event did indeed happen.