If Jesus Christ was who He claimed to be, and He did die on a cross at a point of time in history, then, for all history past and all history future it is relevant because that is the very focal point for forgiveness and redemption.
Here's the simplest answer: Within weeks, the disciples proclaimed the resurrection of Jesus Christ, that He had been bodily raised from the dead and appeared to them.
If they had connived a scheme, and Christ had not been raised from the dead, where would have been the hardest place on the face of the earth to convince anyone? In Jerusalem.
I know many Catholics love God with all their heart. I have genuine respect for anyone who truly has given their life to Christ. We read about Mother Teresa and what a wonderful example she was.
This type of gathering is unprecedented. The time has come for Christians to publicly affirm our Jewish roots, distinctions and oneness in Jesus Christ.
The moment you enlist in the army of God, you personally become a target. You need to remember that if you're living for and walking with Jesus Christ, the powers of darkness are aligned against you.
Anyone who is to find Christ must first find the church. How could anyone know where Christ is and what faith is in him unless he knew where his believers are?