Should Christians keep the Sabbath?

結論から言うと、聖書自体が一つの答えを示していません。複数の読み方が並存しています。

Knowing the situation of the community it was written for makes this much clearer. Sometimes changing translation dissolves the question entirely.

The answer differs depending on whether you're asking historically or confessionally. It may be worth questioning the premise of the question itself.