In answering your question, it is important to understand that your parents eternal salvation is not a reward given to them for their faith. Salvation is not in any sense a reward.
It is a disastrous time for Israelis and for the innocent Palestinian victims of Hamas. How can we, as followers of the Prince of Peace, Jesus the Messiah, respond to difficulties of this day?
Anthropological body/soul dualism certainly seems to be an implication of the teaching of Scripture, particularly concerning the intermediate state between the death of the body and the resurrection at the return of Christ. So we need to consider whether or not there are insuperable objections to such a view.
Oxfords Richard Dawkins, the self-described militant atheist, opens his dated bestseller The God Delusion by laying his cards on the table. He doesnt want you to believe in a god who is a petty, unjust, unforgiving control-freak. Neither do I.
It is a contingent matter whether or not mathematics is applied to the physical universe! The easiest way to see this is to realize that it is contingent whether there is a physical universe at all.