That all depends on which type of God you favor, and then which brand within that group is your specific tribe of choice.
The earth is four billion years old. Most people think the most recent beliefs are almost as old. They don’t realize that the current “brand” of God is less than 2,000 years old. And that the particular brand most on these threads adhere to is less than 500 years old.
You can believe whatever you want. Just don’t dismiss billions of soul to damnation because they were not alive or they just happened to be born in a place that did not even know the current “rules.”
All OT saints we’re saved by Christ as well. Read Hebrews and other boisof the Bible. The OT saints had faith and it was credited to them as righteousness. What happens to those who have never heard? All I know is God is right and just abs it is in Gods hands. What I need to worry about is those that have heard the message including myself. They either respond in faith or are lost. I choose Jesus Christ as Lord and Savior.