To simplify things, let's go with the Christian interpretation of God and satan (who is also known as "the god of this world"). If you read the Bible closely you will learn that the 12 disciples, the 12 tribes of Israel i.e., the 144,000 are a representation of the 12 signs of the Zodiac. We as humans are all made of stardust and are living representations of our star systems. The time we are born and each hour of each day are very important and all of it holds magnetic energy that can influence our behaviour. Our relationships are highly affected by how our astrological components mesh together, so people will feel "chemistry" but that is the magnetic energy pulling them together or apart metaphysically.
Time is working on a sinusoidal wave, so there will be eras of good times and eras of hard times, and God knew this and that is the nature of life: duality. We are working through the Ages, so every ~2000 years will be a new age, and we are actually on the cusp of entering the Age of Aquarius. If we are looking at the classical ancient zodiac, then it begins with Sagittarius who is ruled by Jupiter (i.e., where we get interpretations of "God") and the final two ages are Aquarius and Capricorn, both of which are ruled by Saturn. The word "satan" actually comes from Saturn as the Persians started calling it "planet satan" and then it was brought into Christian teachings. So these final two ages, Aquarius and Capricorn are both considerably satanic ages and they will be they will lead to the prophesied apocalypse as told in the Bible.
It sucks but all of what is created by God has meaning and purpose, and so if there must be destruction and evil, it is to preserve good or something like that. We can only accept the bad even if we don't fully understand it. And even if God is all-knowing, he is still sympathetic to someone struggling and trying their best because he knows that you could be struggling with the cards you were dealt in life. God created us in all shapes and sizes, all types of astrological makeup and nationalities, and all of this is to create beauty and diversity. But sometimes that diversity bites us in the ass depending on where we are born and in what time period. That's why there are legions of angels that seek to help us and why we must pray and believe. There is also guidance in what the Bible teaches, and it's up to us to take that guidance or not. I truly believe in what the Bible says even though I don't always follow its principles.