They will have to answer for their actions?
Really, says who? Dispensing guilt is a hallmark of Catholicism. So happy to have left that religious sect.
Your sins are your responsibility.
Christ died for them. Why don’t you believe you are responsible for your own sins?
OSAS is a false doctrine.
You need to read some of the NDE stories. They tell about going to heaven, seeing their entire life flas in front of them and then being sent back because it was not their time to die.
You WILL see your sin of denial at the moment of your death according to them.
I recommend a book by Dr. Jeffrey Long, Evidence of the Afterlife: The Science of Near Death Experiences.
In it he tells the medical side of each situation and then the person’s viewpoint as they die momentarily. A good read for any scientist.