Since Catholics also believed in the death, burial and resurrection of Jesus, are they saved?
Believing the facts about Jesus' death, burial, and resurrection
isn't the same as the biblical gospel that saves. Scripture is plain on this.
The gospel Paul delivered is what saves when we receive it: "For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures" ~1 Corinthians 15:3-4 (KJV). But Paul immediately warns that any
other gospel brings a curse ~Galatians 1:8-9. It's not just head knowledge about the events. It's trusting Christ alone for forgiveness.
Salvation is by grace through faith, not by adding anything else. "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. The Bible repeatedly says we are justified by faith, apart from works of the law or any religious system ~Romans 3:28, ~Romans 4:5, ~Galatians 2:16.
Catholic teaching adds sacraments, works, penance, Mary's intercession, and the authority of the Church as necessary for salvation. That directly contradicts Scripture's "not of works" and "faith without the deeds of the law." If a person is trusting in those things in addition to Christ, they are not trusting Christ alone. The Bible calls that another gospel.
A truly born-again person will not stay settled in Catholicism long-term. Scripture is clear that salvation changes a person from the inside.
~2 Corinthians 5:17 says, "Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." The Holy Spirit who indwells every believer "will guide you into all truth" ~John 16:13. He does not leave us comfortable with a system that adds works, sacraments, Mary, and the Church to what Christ finished on the cross.
If someone claims to be saved by faith in Christ alone but keeps trusting in those extra things for justification, the Bible warns that's a problem. ~Galatians 5:4: "Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace." True faith rests on Christ alone. The Spirit convicts and leads away from error, not deeper into it.