Why do Christians ume that atheists will pray on their deathbed?

We cannot ume that we or anyone else will pray to God for salvation on their death bed- however if people do , they are saved through Christ= however that is why it says in the word of God- TODAY IS THE DAY OF SALVATION. And besides, no one really knows how and when they may die= we may have time on our death bed- or we could die immediately from a car accident or heart attack. So do not wait.