If sin means "separation from God" as Christians say, then it means that sinning makes you greater than God, meaning that if you sin enough then you would have more power than God or something to that effect.
It's pretty absurd but Christians don't think about what they're saying in these matters.
In the Islamic view, Sin is ignorance and distances ourselves from our innate
fitrah, of which is submission towards the One God, which is the center of our own being, the fire in our own hearts (Qalb). So sin weakens and dumbs us away from our purpose in life of being unified in spirit and being able to attain knowledge (of the spiritual variety, Marifa) and Taqwa (consciousness, awareness of God's imminence).
The idea of "separation from God' is Shirk in the Islamic view because it implies that you are some kind of second God (which is also a logical impossibility and contradiction of meaning), as God encompasses all things (
al-Wasi).
Sin means“miss,” in the sense of missing or not reaching a goal, way, mark, or right point.
So sin does not put us on par with, or above God. It puts us far below what God expects us to be.
We are unfathomably distanced from God.
However, in God's mercy, he has throughout history, made available to man, the means of approach to him, but based on the promise he made at the very start - directly after the fall of man (Genesis 3:15).
(Romans 3:25, 26)
25 God presented him as an offering for propitiation through faith in his blood. This was to demonstrate his own righteousness, because God in his forbearance was forgiving the sins that occurred in the past. 26 This was to demonstrate his own righteousness in this present season, so that he might be righteous even when declaring righteous the man who has faith in Jesus.
Thus God acted immediately after the sin of Adam, but the seed would not arrive until later, because there were requirements that needed to be met according to God's righteousness.
1) The seed must be a king and priest - to rule in the kingdom that would reverse the damage done, and intercede in behalf of repentant ones.
This would take time, since God needed a people whom this seed would come through. Hence (a) when the promise was made to Abraham, God kept it, even the the chosen nation was rebellious. (b) the arrangements God made for the nation - the tabernacle, the offerings, etc, pictured and pointed to the promised seed, and his kingly priestly service. It also prepared people who would be faithful, for that future reality.
2) God's standards require a life be given for a life taken.
Therefore, since Adam's death would result in all his offspring dying, a life had to be given for that life lost... but whose life?
The seed was to be bruised in the heel, according to the promise. Hence, the promised seed was the life that would be given to redeem dying mankind.
All of this took time, but it was necessary for God to accomplish a number of things...
1) Settle the issues raise in the garden, so that it goes on record as finished... never to be repeated..
2) Appoint the one who was worthy.of that responsibility.
3) Bring all things to a completion through that one.
The scriptures presents this is one clear, coherent, and reasonable sequence of events. It's quite fluid actually.
Not strange at all.