As far as Islam is concerned we do not believe that we are born in sin, far from it. We believe that everyone is innocent until they can understand what they are doing which is after the have reached the age of maturity. Even then they are responsible for their own sins. the Catholic church as recently turned its back on believing that unbaptized children will enter hell - maybe they read our stuff!!
We believe that Jesus (upon him peace) was raised up by God to heaven and someone who looked like him was crucified.
We also believe that Jesus (upon him peace) will return before the end of time a Muslim and will kill the Antichrist or Dajjal in Arabic.
He will live a full life and get married, there will be an unprecedented peace on the planet in his time.
Salvation is in belief of one God and this is where you should start, I pray that you'll be relieved on this soon.