hi Philis,
You asked: What is the purpose that you mention above that they are missing?
When someone begins to build something, say a house, their ultimate purpose is not to set a nail in this beam to attach it to that beam and then set nails in other beams to attach to other beams. Their ultimate purpose is not to set floor joists from rim to rim upon which they will then nail the floorboards to. Neither is their ultimate purpose to set in stud walls and hang drywall on them to then divide up the space within the outside walls and paint them and put moldings and so forth throughout. Their ultimate purpose is to build a house. A finished product in which they can live and raise their family. All these things that I've mentioned are merely necessary steps by which they can achieve their ultimate purpose. In other words someone doesn't just wake up one day and say to themself, "I think I'll go out here and nail one beam to another." No! They wake up one day and say, "I want to build a house." And in order to achieve that purpose they then have to do all these intermediate steps.
Similarly, when God thought to 'build' a new realm of creation His purpose was to 'build' a home for a new and different creature that He would create to love and serve Him and be loved and served by Him. So, to me, this idea that this all powerful, all knowing, all wise God took billions of years to create that for which He has the power and wisdom and knowledge to just speak into existence in merely a moment seems ludicrous. He's God! He can take an empty black void of space and just by the word of His mouth, fill it from one end to the other with millions, billions of stars, planets, asteroids and the like. Each one perfect and necessary for this realm in which mankind would live. So, as I understand what God has caused to be written to me through the Scriptures, He has told us that that is exactly what He did.
He wanted to build a home suitable to sustain the life of man and He in practically an instant, spoke the earth into existence. No other stars or planets or anything else anywhere in all the universe. He then spoke all of the other intermediate steps to build this home for man. But His ultimate goal in creating was to build a home for man and the God I know doesn't need millions or billions of years to accomplish that.
However, God also had an even more awesome purpose in all of the creating that He did. His ultimate long range purpose was that what He was creating; a home for man who would then sin and need to be redeemed, was to get to the last page of God's revelation to us. "Now the dwelling of God is with men and He will be their God and they will be His people."
So, this idea that God would just start some speck of some kind or some rudimentary framework through which nature would complete the 'home' for man, comes from not understanding the purpose, the power, the majesty, the wisdom of God. God began at some point in His time and took six literal days to build this home for mankind and then He rested. By the way, once the earth was created, if it was spinning on it's axis at roughly the same speed at which it spins today, a day would have passed in roughly 24 hours. I hope that you understand that the literal and current definition of a 'day' doesn't take into account anything as far as the sun and moon being necessary for its completion. A 'day' is merely one full rotation of the earth upon its axis. If you look up the length of a day in any encyclopedia for any of the other planets in our solar system you will find that the calculation of the length of their respective days is nothing more than the calculation of the time it takes for each planet to make one full revolution upon its own axis. I say this because many retort with, "Well, you can't have a day without the sun and the moon." Yes you can!
The God I serve knew exactly all that He was doing when He said the first "Let there be..." and He didn't need millions or billions of years to accomplish the ultimate purpose for His having said that.
However, science does not accept that there are miracles. The basic foundation of science is that everything is explainable naturally if you know all of the necessary variables. So, they argue that the earth must be billions of years old because we couldn't see any stars if it were only 6,000 years old. There are, according to the speed of light, no stars close enough, other than our sun that we would be able to see based on that speed. They refuse to allow such statements as, "Well, yes we know that in the natural world that now exists that light travels at this speed, but if we accept that the creation was a miracle of a God who has the power, wisdom, and knowledge to override all such natural events, there is no reason to believe that when God said, 'let there be stars in the heavens', that He didn't cause the light of those stars to be instantly visible all across the universe." Science does not allow for that possibility and from what I know of the power, glory and majesty of God, that's a very real possibility. That when God spoke the universe into existence that stars nearly instantly cluttered the heavens like the grains of sand on a seashore and that the light from each and every one of them was visible from one end of the universe to the other. That's the power, glory, majesty and purpose of our God.
By the way, I apologize that my posts are so long, and I acknowledge that you have commented about their length a couple times, but consider that it took God 700 pages of fairly small typeface to convey all that He wanted us to know and issues such as this can't be taught and explained in short 3 or 4 sentence posts. So, I hope that you will not only be patient in reading my posts, but give serious consideration to all that I am saying.
God bless you.
In Christ, Ted