﴿ وَلَآ أَنتُمْ عَٰبِدُونَ مَآ أَعْبُدُ ﴾

“and neither will you [ever] worship that which I worship.”

nor will you worship in the future what I worship God knew that they would never become believers the use of the inanimate mā ‘what’ to refer to God is meant to counter the reference to ‘what thing’ they worship.