According to some christians as in the bible those who aren't christians go to hell

2/7 go to heaven. The majority go to hell. Great job.

Dont know about others, but i cant start believing in god just like that. Seems kinda impossible to me.

Accept Jesus as your saviour ? Anyway with all the different religions that says we are going to hell if we do not share their beliefs, everyone is basically going to hell. No ?

Its not enough to say you accept Jesus as a savior, you need to really mean it, and you really cant mean it if you don't believe God exists.
The thing is that people think that there is only one right religion, other religions are just some people worshiping false god. So naturally you believe your religion is the right one and therefore only people in that religion gets into "heaven".
Although some intellectual religious people say all religions are connected, and every religion actually worships the same god. But i don't know more about this idea.