This notion of a "tussle between the forces of good and evil" strikes me as totally illogical. You, and all Christians, so far as I can tell, accept that God is omnipotent. Now, unless Satan (or whoever you credit for the "forces of evil") is similarly omnipotent, then there is no tussle even possible. It's over before it starts.
It isn't impossible if there is a valid reason for it.....people like you apparently like to compare God to yourselves and because you can't see a valid reason for any of it, there can't possibly be one. To say you don't understand is probably an understatement.....but hey, you really don't want to know....or do you?
God is not only Omnipotent, but also Omniscient, therefore he know what we cannot, and he can see the future before it happens. He sees 'from the beginning, the finale'. (Isaiah 46:10) From that vantage point, he can see the best way to handle a situation as soon as it arises.
Look, if only one side is infinitely powerful, then let us be clear, the other side has only finite ability. And finite -- wait for it -- infinitely less powerful than infinitely powerful.
This battle is not 'God verses the Devil' because there could be no contest.....this is a battle for the hearts and minds of men....in fact it is a battle for the loyalty of all his intelligent creatures...both human and angelic. Remember that the first rebel was not human, and it was really he who wanted to be 'like God' and have the humans worship him, and do his bidding.....but first he had to separate them from their Creator by using slander and lies. He chose the woman because he knew that through her, his tactic of "divide and conquer" could work on the man......and it did.....it still does.
Created with free will, the devil used that freedom against mankind right at the outset. He called God a liar and convinced the woman that God had bad motives in claiming the TKGE for himself. She fell for those lies, but her husband did not. By her actions, he forced the man to divide his loyalties....so he chose to side with his wife rather than to remain loyal to God who up to this point had shown them nothing but loving generosity.
You see "self-interest" can conquer even an angel if his free will is abused.
We now have a written record of all that has transpired from the first rebellion, down to today, so that this failure on the part of the devil and his minions to steal worship away from the Creator will be settled for all time to come. There will never be a challenge to God's Sovereignty again. Precedents are set forever.
And if both sides are infinitely powerful, there cannot ever be a winner -- the battle must go on, futile skirmish after futile skirmish, forever.
Satan never challenged God's power......he challenged his sovereign right to set the limits of the freedom that he gave to the humans. Free will cannot be totally free because that is open to abuse, just as the devil demonstrated by stepping out of his own restricted freedom to encourage the humans to do the same.
How would God handle this rebellion and misuse of free will (supposedly a gift) and bring about the success of his purpose in the end? How did it even happen in the first place? Why did God created his intelligent creatures with free will if it could be abused?
Angels were used at times as God's representatives, who sometimes spoke for him and carried out his instructions for them. Free will gave them options to use their intelligence in ways that animals (solely programmed by instinct) could not. Humans too were to represent him here as caretakers of this planet, having dominion over all other lifeforms. They too needed this attribute to make decisions as circumstances arose to problem solve and bring about a good outcome like God himself would. Free will, used correctly, would be a wonderful gift.....but abuse turned it into a curse as the will of some dominated over the will of others, causing friction and division.
Angels never had a need to step outside of their natural position in God's scheme of things.......
until there were lower intelligent lifeforms who could see a 'wannabe' as a god. Satan was in a guardianship position in the garden and saw everything that transpired there. He began to entertain wrong thoughts and plotted his move very carefully. If he approached the man first, he may well have been rebuffed, (as Adam had been well educated by God before he was provided with a mate) but satan used the woman to bait the man. He successfully divided his loyalties and the rest was the outcome that satan had hoped for.
But it seems that he underestimated God's reaction to the rebellion he had caused. i.e. eviction from the garden to a cursed wilderness outside, and denial of access to "the tree of life"...the only means they had to live forever. (Genesis 3:22-24)
It meant that death would eventually overtake the human race and satan's 'worshippers' would die and need replacing. It meant that he constantly needed recruits. His solution? False worship. By satisfying the natural inclination of man to worship, he gave them false gods who strongly resembled himself....selfish, violent and licentious.
So why didn't God just destroy the rebels and start again? Because the issues raised in Eden had to be settled once and for all, or else another "satan" could emerge from the ranks and start it up all over again. God chose to step back and allow the rebels all the freedom they desired because he wanted them to see first hand where that course of independence would take them.....look at our history of self rule and tell us when there has ever been a truly successful world ruler who was not corrupted by their power over others? Satan is the power behind "all the Kingdoms of the world". (Luke 4:5-8; 1 John 5:19)
This is an object lesson of mammoth proportions because ALL of God's intelligent creation are on trial. There are two sides and we have to choose who's side we are on. At the end of the day, there are only "sheep" and "goats"....we place ourselves in either one category or the other by our own free willed choices. There is no fence to sit on, and those who despise God will not be forced to live in his Kingdom, which will eliminate all satanically inspired human rulership and replace them as man's only government. (Daniel 2:44) The devil and his hordes will go into a prison-like abyss for 1,000 years until the Kingdom of God in the hands of his Christ has eliminated sin from the world forever.....then after one final test, all opposers of God and his kingdom will simply disappear....never to be seen again.
Then God can get on with whatever plans he has for the rest of this vast Universe.....unconstrained by time, he may well end up populating the whole Universe....? Who knows?
All you've done is tell me how imaginative you are, since every claim you make is made in the total absence of evidence for its veracity. You may live your fiction as you like, I will carry on living my reality.
If you "know" scripture, rather than "think" you know it, then the big picture has been there all along...it was just lost between the lines, ready to be revealed in the end times.....and here we are.
Where are you?