First, there are doctrines or beliefs for which we would die.
These are truths we hold with great fervor—non-negotiables. If someone doesn’t hold to these, they aren’t a true follower of Christ. One example would be the deity of Christ. You cannot be a Christ follower and not believe that Jesus Christ is God. Because if He’s not God, then how did He rise from the dead? If He’s not God, then how can He be seated at the right hand of the Father in glory and majesty? If He is not God, then we have bought into a story of a martyr and not the King of Kings.
But when it comes to the issues of end times, what doctrine we would die for? The very truth that Jesus Christ is coming back. Why? Because if Jesus Christ isn’t coming back, then He told a lie to His disciples in John 14 when He said, “I’m going to prepare a place for you. And if I’m going to prepare a place for you, then I will come back and bring you to be with Me.” Well, if He’s not coming back, He just told a bald-faced lie to His closest associates. If He’s not coming back, then He lied in the second to the last verse in the Bible, Revelation 22:20, when He said, “Surely I am coming soon...” If He’s not coming back, then Jesus just lies and at numerous times says, “I’m coming back.” He’s a liar and the truth is not in Him. As I said, all branches of Christianity say Jesus Christ is coming back. They differ on the details, but on that one truth they agree.