If you don't believe that, you most certainly are not a Christian.
That's not an optional belief.
It's as fundamental as any principle of Christianity.
Ephesians
2:8 For by grace are ye saved through faith; and that not of yourselves:
it is the gift of God:
2:9 Not of works, lest any man should boast.
I am a Christian,though many so called Christians on FR,make me wonder if they are.
Reread what I wrote and if you are still in a quandary,get someone with better comprehension skills to explain it to you.