Sassy,
'kind' athiest and an 'hateful' Christian... What kind of comparison do you see in that?
How does either state of being apply to just one or the other?
How do you apply being kind to atheism?
How do you apply being hateful to Christianity.
These are both states which are not mutually exclusive to Atheism or Christianity.
Being kind or hateful can apply to any person and it is not something which applies to either atheism or christianity in it's representation of one or the other.
I see no way of making such a question possible of an answer.
You've missed the point. Two souls present themselves at the pearly gates, and St Peter looks at the first and says, "Well Mr Atheist, not feeling so clever now are we? Now then, let me just check the record...ah, very good. I see that you founded several orphanages, discovered a cure for male pattern baldness and gave away all your money to the poor and needy. Very well done!
OK, now to you Mr Theist – congrats by the way for backing the right horse all along. OK, let me just check the records...
...oh dear oh dear oh dear. It says there that you were a mean spirited son of a *****, stealing from the church collection, knocking the helmets off policemen, never once performing even a simple act of kindness. Tut tut tut...
OK, here's the good news though: it also says here that you Mr Theist "accepted Jesus as your saviour" so you can come right on in (oh, it's a no shoes policy here by the way - helps protect the Axminster you know.)
Right then Mr Atheist, your turn. Sadly, it's not such good news I'm afraid. See, you didn't believe in the salvation offer so I'm afraid it's no non-fattening pizza and endless re-runs of Songs of Praise for you my friend. Toasting fork time it is!"
Hence the question: why would your God arrange things this way rather than on the basis of merit?