Islam & christianity are totally different.
The thing is, people seem to have God who created this world, as logic. People think there must be a God.
So, they have religions using a Most high God. =]
We aren't the same. And only one can be true.
And that's Christianity. Try studying it and...
Because most non christians ate christians so much they are ignorant to believe. And some try their, and they do convert.
Atheist are so full of them selves, so the motive of christianity won't ring a bell.