The Sacred Congregation of the Propagation of the Faith, under Pope St. Pius X, in 1907, in answer to a question as to whether Confucius could have been saved, wrote:
“It is not allowed to affirm that Confucius was saved. Christians, when interrogated, must answer that those who die as infidels are damned”.
What does this mean? It is very clear, and really needs no explanations, except in our times, because Catholics have been brainwashed to believe that everyone who is nice to others will go to Heaven.
It is saying that if someone dies an infidel, they are damned. It does not say they may be damned, it says they are damned. For those who answer, no one but God knows who is damned, I answer that what God knows is irrelevant here, as it is God Himself who is telling us here that if someone dies an infidel, they are damned. That "if " is a qualifier, without the "if", this means nothing. It is no coincidence that they use Confucius, as an example, for who could be more "nice" than Confucius?
You can also change that to: It is not allowed to affirm that any non-Catholic was saved. Christians, when interrogated, must answer that those who die as non-Catholics are damned”.
Some typical modernist objections I've been asked on CI:
Q: What if a baptized Protestant had a deathbed conversion that we knew nothing about?
A: That is what is called a qualifier, it changes everything, the person then would not be a Protestant, he would be a Catholic convert. The Sacred Congregation of the Propagation of the Faith quote above does not apply, the person is a Catholic, not an infidel or a Protestant.
When we are asked about the salvation of the dead of other religions than the Catholic religion we are told to answer "those who die as infidels are damned".
We can't say may they (Billy Graham, the Dali Lama, or Ghandi) rest in peace, for rest in peace means he is in Heaven.