As christians, there are two vital elements for salvation. Repentence of sins, and belief that Jesus, the Son of God, died on the cross for our sins, and rose again on the third day. Other things are quite important to our faith, but not vitally essential for salvation. For this reason, people can be unsure / doubt / even be wrong about their views on evolution / creation, without damaging their salvation.

Now, I do believe it is very important to believe everything that the bible says, but I would not assume that someone is unsaved because they have a different interpretation of the story of creation in the bible to me, or a belief about creation that is incompatable with the bible.


For you... I wonder whether there is an analogous concept of salvation and minimum requirements / beliefs for salvation in Islam?

Forgive me if I am way off topic .
We believe that Allah can choose to forgive anything but he will not forgive disbelief. In saying this it doesn't mean that non-Muslims will automatically go to hell. The Quran says quite specifically that there will be non-Muslims who will go to heaven because of their piety and charity and if a person has had no chance to be properly acquainted with the true teachings of Islam then they will not be condemned for that because it is beyond their control.
If you believe something that is wrong and you do so in good faith then it is my understanding that it is ok.