Okay so a little back story... I grew up as an agnostic. My mom was raised Catholic but doesn't believe Jesus is the only way to salvation and is pretty liberal about it all. My dad was raised Muslim and is semi-practicing, but definitely believes Jesus was not God. His entire family lives in the Middle East and are all committed Muslims.
Does God save people's souls—even if they're an unbeliever—by another believer's prayer? I don't see any way that I could get my dad to believe in Christ, mainly because he would have to acknowledge that his deceased brother, as well as the rest of his family, will go to hell because they believed in a lie. Basically, my dad will never be a Christian from what I know about him, but can my prayer be the source of their salvation? I understand that ultimately everybody is responsible for their own salvation, and nobody can make up their mind but them. Does God make exceptions for his believers?