Your friend is imposing a rule on Christ that the importance of a teaching is directly co-related with the order in which He taught it. Your friend’s rule is arbitrary and unbiblical for that matter. Furthermore, the Jews had been praying for centuries before Christ. The people of God were familiar with prayer prior to the Incarnation.
The world is corrupt and subject to certain wiles of the devil who prowls about the world for souls to devour until Christ comes again. Plus there are plenty of people who don’t pray. Also the effectiveness of prayer is not co-related to how much war there is in the temporal world. The effectiveness of prayer is related to the proximity of souls to God regardless of whether there is war or not. Your friend is demanding empirical proof when God may want your friend to accept the power of prayer on faith.
What?
Since we are in the temporal world of time, and since God is outside of time, we must follow through in obeying Him and praying in order to bring about the will that He foresees. If you refuse to pray, then He foresees you not praying. Also, prayer involves listening to the prompt of God as to what He wants us to do in our lives. It’s not just God responding to us.
Jesus intended for them to pray while He also prayed (cf.
Mk 14:38)
No, Jesus prayed quite a bit. I don’t know what your friend is talking about.