1)Jesus is the only begotten son of God and salvation is possible only through him. If you do not believe in Jesus you are sinning and hence you will be sent to hell. All others are heathens and hence need to be baptized. If that is the case then did all people before Jesus went to hell? 2) Islam says there is no God but Allah and Mohammed is his last messenger. All polytheists, people of the book (Christians and Jews) are kaffirs and filthy. All Darul-harb must be converted to Darul-islam at any cost.
This problem is even more manifested now-a-days (see middle-east crisis).