At the end of the day, that's all any of us can do. Practice the greatest theological virtue, Charity (including praying for one another and for unbelievers), and rely on His mercy.
"Give glory to the Lord of lords: for his mercy endureth for ever."
God saves who He wills, and none of us have the right to tell Him how to do His job.
I'm amazed at how many Catholics become Calvinists when talking about Muslims.
You are so right on the mercy.
While we are alive, Christ is perfect mercy.
At the moment of our death, Christ becomes perfect justice!