First off, where did you get those choir samples? I really like them! Secondly, as far as what you have, the structure seems nice. It definitely needs an intro though and maybe some form of an outro. Maybe bring in the bells solo at the end with a little extra reeverb, that might sound nice. The mixing and mastering is very nicely done. As far as similarity goes to the original song, I really haven't heard the original to much, but as a general rule, I always like to keep some melody from the original song and maybe mix it up a bit. But I always like to keep one melodic line there. Listening to your song though and the original I can definitely tell there is a tie. So I guess that is good lol. I hope this made sense.
P.S.
Sorry if it sounded a bit all over the place, I was writing down comments as i listened to your song.