Why doesn't Christianity commemorate Christ's death and resurrection after the Jewish Passover?

It's always before.
Because according to the bible, the last supper was a Passover meal, therefore he was crucified during the Jewish Passover Festival.
Update: I do know the formula for Easter, but surely the Christian church should be side by side with the Jewish dates. Did the the early church do this to separate themselves from any association with Judaism and also align themselves with the pagan spring festival to Astoreth, in the process winning Pagans over.
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