Let the Quran speak for itself:
Millet Ibrahim is hajj. But hajj in Quran has no stoning idols, running between hills, sleeping on mountains, zam zam water etc.
Millet Ibrahim is saum. But Quran does not forbid menstruating women, or say we have to look to moon to start saum month.
Millet Ibrahim is salat. But Quran does not have the instructions for the ritual prayer; it does have verses where all in the heavens including birds do salat which allows us to think what this means or else ignore it.
Millet Ibrahim is circumcision. But Quran says Allah has shaped, fashioned and perfected us, so how can we chop a bit off?
Millet Ibrahim is stoning. Quran says 100 lashes but it does not say you cannot stone to death so your argument that we can do what it does not stop is proved false by this example which you do not understand the implications of.
Two disputing parties, one says you can do this, other says it is not in Quran and we do not have to. One wants more, the other says Quran is enough.
4:116 God will not forgive Shirk (choosing ‘authorities’ besides Him), though He may forgive other transgressions according to His laws of forgiveness. Whoever commits Shirk, has strayed far, far away. [4:48. Associating idols or human ‘authorities with God in matters of obedience, subservience, worship and laws-giving, is choosing parallel authorities (114:2-3). This is a folly that downgrades human ‘self’ to the extent that it bars it from rising to the higher levels of self-actualization (9:113). And the ‘self’ then faces an Insurmountable Barrier to evolution in both lives. 22:51, 79:39]