Salam,
Imam Ali says in the first sermon of Nahj al-Balagha that God doesn't have any attributes. Imam Reza reiterates this in Sheikh Saduq's al-Tawhid. Shia Islamic scholars have interpreted this as meaning that all the traditional attributes of God (e.g. omniscience, omnipotence, etc.) are identical with God and are not distinct or "accidental properties" of God.
But this creates the problem of mercy and freedom. If mercy is an essential property of God, and not an "accidental property," then that means God must be merciful (or else He wouldn't be God anymore). This seems to contra