> Quran 2:115 states that wherever you turn, there is the Face of Allah.
So Allah is everything or at least he is IN everything. The universe is everything.
> the Quran states that He specifically created mankind to know Him.
Mankind experiences Allah, the universe.
Would you agree with this kind of mapping or am I making any unjustified leaps here?
One meaning for His Face being everywhere is that everything is turned towards Him whether they know it or not, since He is the giver of being. It does not mean a literal encapsulation or identification of the Infinite with the finite.
Rather, closer to your sentiment from an Islamic theological perspective is to say that what we experience in the universe is an interplay of His attributes since He is the causer.
I define salvation as: 'being preserved in Heaven', and in Islam this is sought through forgiveness.
Quran 39:53 Say, “O servants of Mine who have transgressed against their own selves, do not despair of Allah’s Mercy. Surely, Allah will forgive all sins. Surely, He is the One who is the Most Forgiving, the Ever Merciful."
Quran 50:16 states that Allah is closer to man than his jugular vein and Quran 2:115 states that wherever you turn, there is the Face of Allah.
Now to answer why He cares, the Quran states that He specifically created mankind to know Him.
And indeed, the recurring injunction in the Quran is to remember Allah, because you already know Him—Quran 7:172 states that we testified to His Lordship in a pre-birth state.