Two thoughts. First, Jesus said that in the resurrection there would be no marrying or giving in marriage, that we would be like the angels in heaven (Matt.22:30), though to be more accurate this would be because everyone will already be married, in the sense that they will all be the Bride of Christ, married as a unit to Him. How sex is handled, of course, is anyone’s guess.
Second, I once speculated, in a talk I gave a few years ago, that God is outside of the constraints of space and time—which we know is true, that humans on earth are inside the constraints of space and time—which we also know is true—but that angels are outside the constraints of space but inside the constraints of time: they can instantaneously be wherever God needs them to be, but while they can see the future, they cannot be in the future until the future becomes the present.
The purpose of the speculation was an attempt to understand why Satan had it in for us. Lucifer could see what was coming, that God was going to create human beings and destine them to rule over the angels (I Cor. 6:3). Lucifer (”light-bearer,” the presenter of God’s glory) did not want to be supervised by a being created after him, much as we become jealous when a younger person at our work is promoted over us. So Lucifer first tries to overthrow God, gets 1/3 of the angels on his side, and loses. Then he tries to separate humans and God in the Garden and succeeds, but God, instead of letting Satan back into his old job, curses the serpent by, among other things, setting up a plan of redemption—which Satan tries to thwart at every step, from Cain killing Abel all the way to Christ on the cross.
When that doesn’t work—when Jesus is raised from the dead in spite of all of Satan’s efforts to keep His resurrection from occurring—all Satan has left is to try to get as few humans redeemed as possible, and to make the lives of the redeemed so miserable that it will deter others from accepting redemption. But Satan can see what’s coming, though he keeps lying to himself that he can somehow stop it from happening, if only he tries just a little harder. Our resurrection is the ultimate promotion, where we obtain our foreordained position of being second to God, and ruler over angels. Needless to say, I don’t make of this a necessary point of doctrine, only a reasoned speculation based on the Scriptures’ teachings.
“but that angels are outside the constraints of space but inside the constraints of time: they can instantaneously be wherever God needs them to be, but while they can see the future, they cannot be in the future until the future becomes the present.”
I don’t think this is right, because when you read of prophets who were given visions of the future, they are often “transported”, with an angel, to the time and place they are witnessing. They aren’t just passively seeing images of the future either, as we have examples of prophets interacting with people, asking questions, and being given answers, being given objects and being instructed to do things with them, etc. So if the angels have the ability to transport humans to the future and back, it only stands to reason that the angels must have this ability themselves, though they may only be able to use it as God authorizes them to.
**Second, I once speculated, in a talk I gave a few years ago, that God is outside of the constraints of space and time—which we know is true,**
True.