This might help just a bit:
A brief general description of the Catholic idea of salvation through Jesus Christ.
www.being-catholic.org
While you may not know God's actualy DECISION you do, indeed, have specific rules for salvation. This is called "soteriology".
The Catholic Church DOES have rules for salvation
From the
Catholic Catechism
1696: "The way of Christ "leads to life"; a contrary way "leads to destruction". ....shows the importance of moral decisions for our salvation.
Means for salvation (830, 980)
the requiment of baptism (1256-1257),
gift of salvation offered through Christ (1811)
Sacraments necessary for salvation (pg 1129)
"Service and witness to the faith necessary for salvation" (Pg1129)
So there DO appear to be rules even in Catholicism. Again, while I don't expect you to know the mind of God, it seems that there are rules that are to be followed.