Should we study prophecy? Is it important? Does it matter if we understand Revelation and the Rapture? Absolutely! Why?
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work. 2 Timothy 3:16-17
Since every single Word is breathed by God, then every Book, Chapter, Verse and Word is of great import, including those passages that are tough to understand. Everything God wants us to know, He has written in His Word, so that we may know Him, His heart, and the plans He has for His creation.
Now, brethren, concerning the coming of our Lord Jesus Christ and our gathering together to Him, we ask you, 2 not to be soon shaken in mind or troubled, either by spirit or by word or by letter, as if from us, as though the day of [a]Christ had come. 3 Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of [b]sin is revealed, the son of perdition, 4 who opposes and exalts himself above all that is called God or that is worshiped, so that he sits [c]as God in the temple of God, showing himself that he is God. 5 Do you not remember that when I was still with you I told you these things? 6 And now you know what is restraining, that he may be revealed in his own time. 7 For the [d]mystery of lawlessness is already at work; only [e]He who now restrains will do so until He is taken out of the way. 8 And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. 2 Thessalonians 2:1-8