Roman Catholics believe devout Muslims are saved.
If that is true, then, sorry, but those Roman Catholics are wrong. I don't think it is true, however. My mother and father are both very devout RC's and I know that they don't believe that devout Muslims are saved. Muslims do not believe in salvation through Jesus Christ (who by His death paid the penalty for our sins that we could never pay) so to believe that they are saved by being devout Muslims is wrong doctrine. The Bible (God's Word) is very clear on that.
Catholicism does not teach the same doctrine of salvation that most Protestants believe in.
"Though we or an angel from heaven preach any other gospel unto you than that which we have preached unto you, let him be accursed...a man is not justified by the works of the law but by the faith of Jesus Christ...for by the works of the law shall no flesh be justified." Galations 1:8, 2:16
"For by grace are ye saved through faith, and that not of yourselves: It is the gift of God, not of works, lest any man should boast." Ephesians 2:8,9
Compare and contrast that with the Roman Catholic Church's teaching:
"If anyone says that the sacraments of the New Law [of the Roman Catholic Church] are not necessary for salvation but...that without them...men obtain from God through faith alone the grace of justification...let him be anathema." Council of Trent, 7, General, 4
God Himself declares that it is by faith alone, yet the Catholic Church feels they can countermand God.
But one of the many reasons I left the Catholic church.
Not necessarily. RCs believe that it's possible for devout Muslims to be saved by Christ. But it hinges on many caveats -- it presupposes the fact that such a devout Muslim never heard the Gospel, never was exposed to Christianity. A Muslim is accountable for informing his conscience to the best of his ability, and if he were exposed to the truth of the Gospel and did not further investigate, then he would be culpable for his own ignorance in that case. However, there would be mitigating circumstances -- was he briefly exposed? had he been brainwashed into thinking Christianity was evil? etc. These types of things could be considered extenuating circumstances.
However, the point is, it's no simple "Follow your conscience, and you're in." That attitude belies a presumption of God's mercy, and is a grave sin in itself. I think the better way of phrasing it is that "Salvation is possible outside formal membership within Christianity."
On what basis do you believe this, especially when Christ himself says that "no one comes to the Father but by me".
Do you mean Roman Catholics believe Osama and the all murderous terrorist are going to be saved? After all they (terrorist) must be very devout Muslims to commit suicide in order to kill others.
Unless you are talking about a special kind o "Catholics" very influential in US who defend and promote homosexuality, are openly pro-death, and at the same time receive holy communion every day, not to mention they elected Clinton, mainly cause their degenerate priests told them to do so.