Afraid not. Thinking that angels have to put on a flesh body just to appear in our earthly dimension is part of the old Jewish traditions of men. This is why they cannot understand about the resurrection body that Apostle Paul taught in 1 Corinthians 15, which is about a "spiritual body", not a flesh body. Instead, they believe the old idea of soul sleep, with the future resurrection being about their literal flesh body in the casket being raised. No, on the last day those still alive on earth, their flesh will simply be cast off, revealing their spiritual body. We at present have two bodies, one of flesh, and another one of spirit, Apostle Paul revealed this too in 2 Corinthians 5.Angels are incarnate in human form at times (Genesis 18:2-8) for the purpose of ministry, but I believe only God can give them human form. I have never read in the scriptures where any angel, including Satan and his hoard of angels that follow after him, can supernaturally take on human form by themselves as I believe only God can give them human form for the purpose of His ministry here on earth, but I could be wrong as I can't find any scripture on this.
That's right, Satan is not a co-equal with our Heavenly Father. But Lord Jesus is.Satan, being a fallen angel, is a powerful spiritual force, but not as powerful as God and his power, unlike God's power, his will come to an end.
Nations will rise against nations as they always have and will increase in the end of days as the workings of Satan are done through men that have not the Spirit of God dwelling in them.
Eph 6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Also no, nation against nation will not... be happening at the very end of this present world for the trib.
The great trib is going to be a time of "Peace and safety" for the deceived. This is why Jesus revealed that as along as we hear of wars and rumors of war, the end is not yet, the end being the great tribulation time.