Evening and morning were the first day.
Through one man death and sin entered into the world.
look carefully at the words.
evening, morning, the first day.
there are two distinctly different ways to interpret these simple 5 words, both fit.
sequentially, evening, morning, the first period of daylight.
recapitulation: evening, morning, (restart) the first day*
can you see why assuming your interpretation is the only proper one is problematic? just 5 words and you can not demonstrate which one is the only correct way to read it.
notes:
*sequentially is the same as saying, it is 6pm monday evening, it is now 6am tuesday morning, now dawn has broken and tuesday's daylight occurs.
recapitulation is the same as saying. 6pm nightfall, now darkness, then 6am and dawn, then the daylight, this is defined as 1 day period, from sunset to sunset.
now how complex is the situation if just 5 common words can be seen in such radically different ways?