Jesus did not say that God would stop Christian persecution.
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the Bible says we will definitely be persecuted
You are correct. Not only did He not say it would be stopped, He said to expect it and that it would get worse:
Matthew 24:3-14 & 22 3 As He was sitting on the Mount of Olives, the disciples came to Him privately, saying, “Tell us, when will these things happen, and what will be the sign of Your coming, and of the end of the age?”
4 And Jesus answered and said to them, “See to it that no one misleads you. 5 For many will come in My name, saying, ‘I am the Christ,’ and will mislead many. 6 You will be hearing of wars and rumors of wars. See that you are not frightened, for those things must take place, but that is not yet the end. 7 For nation will rise against nation, and kingdom against kingdom, and in various places there will be famines and earthquakes. 8 But all these things are merely the beginning of birth pangs.
9 “Then they will deliver you to tribulation, and will kill you, and you will be hated by all nations because of My name. 10 At that time many will fall away and will betray one another and hate one another. 11 Many false prophets will arise and will mislead many. 12 Because lawlessness is increased, most people’s love will grow cold. 13 But the one who endures to the end, he will be saved. 14 This gospel of the kingdom shall be preached in the whole world as a testimony to all the nations, and then the end will come.
...22 Unless those days had been cut short, no life would have been saved; but for the sake of the elect those days will be cut short. (NASB)