The Jews are currently a tremendously hard sell on Christianity due to the Spiritual blindness imposed on them by God. Paul was crystal clear on this. Now the question is why did God do this? Several reasons.
First, is for us Gentiles to have this wonderful age of grace, which we did not have prior to Christ coming and doing the work he was sent to do. Second, is for the glory of the physical salvation of the Jews in the Gog-Magog war. Third, is the glorious spiritual mass salvation of Jews in the Great Tribulation, otherwise known as Jacob's Trouble. Fourth is for Christ to reign for a thousand years from Jerusalem in the midst of his restored and chosen Israelite people. Fulfilling his promise he made to Jacob concerning his seed after they wrestled. Fifth is the final glorification of God when Satan is released after Christ's thousand years reign and Satan gathers the nations to come against Israel the final time and God utterly destroys all his enemies. It is folly to think that the Jews attain salvation without trusting Christ. The two wonderful witnesses sent by God testify of Christ for the first 3.5 years of the Great Tribulation, when they have completed their testimony, God allows the Antichrist to slay them. After 3.5 days of laying dead in the streets, the Lord restores life back into his two wonderful witnesses. Unlike Christ's resurrection and ascending, which were not seen by the unbelieving. The two witnesses resurrection and ascending are seen by the unbelieving. At that point, man shall know that the Lord does indeed have resurrection power. Coupled with the Antichrist proclaiming himself to be god, at virtually the same time, the Jews will realize that the Lord Jesus Christ was indeed the Messiah. And they Shall Believe. This is when the Jews must flee, for when the two witnesses are called to Life, the Antichrist will be proven to not have power over death and that indeed our Lord has conquered death. Exposed to not be the god he proclaims himself to be, the brutality of the beast will be unleashed upon mankind and martyrdom shall be increased, for many will trust in the Lord's resurrection power. I would not want to be a foolish Replacement Theologist that must stand before God and answer for despising His chosen people.