It is important for Christians to follow the Holy Bible, and not human ideas, such as Dispensationalism, even if it sounds interesting and fun.
What does the Holy Bible say about Israel and its role in the death of Jesus Christ. The four Gospels clearly states that Israel as a nation officially condemned Jesus Christ to death!
The Sanhedrin was the Supreme Court of Israel, and it condemned Jesus Christ to death.
The Gospels in the New Testament is clear that Israel as a nation sought to kill Jesus Christ, so it is wrong for Christians in the USA, UK, Canada, Australia, New Zealand, and other countries to support Israel as a nation.