Comment: they are not contradictions

they are simply two of the last phrases he said then he died it doesnt mean anything except that luke focuses on one phrase and john on another. eye witness accounts are often proven to be true because different people point out different things that they saw, in fact the best way to tell people are lying about an eye witness account is by having them say the same exact things, so two different people seeing different things during the same scene actually proves authenticity.

You need to define flawless and perfect. The Bible even though it contains history and eye witness accounts is not a history book, every word is in there for a reason, you could say all the fat has been cut out.

Basically the phrase about not knowing Gods name is found through out the old testiment and it is always referring to people not knowing a characteristic of God.