Saint Paul writes:
"And so I make known to you, brothers, the Gospel that I preached to you, which you also received, and on which you stand. By the Gospel, too, you are being saved, if you hold to the understanding that I preached to you, lest you believe in vain. For I handed on to you, first of all, what I also received: that Christ died for our sins, according to the Scriptures; and that he was buried; and that he rose again on the third day, according to the Scriptures; and that he was seen by Cephas, and after that by the eleven. Next he was seen by more than five hundred brothers at one time, many of whom remain, even to the present time, although some have fallen asleep. Next, he was seen by James, then by all the Apostles. And last of all, he was seen also by me, as if I were someone born at the wrong time. For I am the least of the Apostles. I am not worthy to be called an Apostle, because I persecuted the Church of God. But, by the grace of God, I am what I am. And his grace in me has not been empty, since I have labored more abundantly than all of them. Yet it is not I, but the grace of God within me. For whether it is I or they: so we preach, and so you have believed. Now if Christ is preached, that he rose again from the dead, how is it that some among you say that there is no resurrection of the dead? For if there is no resurrection of the dead, then Christ has not risen. And if Christ has not risen, then our preaching is useless, and your faith is also useless. Then, too, we would be found to be false witnesses of God, because we would have given testimony against God, saying that he had raised up Christ, when he had not raised him up, if, indeed, the dead do not rise again. For if the dead do not rise again, then neither has Christ risen again. But if Christ has not risen, then your faith is vain; for you would still be in your sins. Then, too, those who have fallen asleep in Christ would have perished. If we have hope in Christ for this life only, then we are more miserable than all men." [1 Corinthians 15:1-19]
If the Lord Jesus Christ was not raised from the dead then Christian faith is empty falsehood.