>Is there any theory why Jews are so successful?
God intended for Jews to utilize their energies and talents to evangelize the world for Christianity. The model for this is the prodigious efforts of St. Paul, who accomplished so much in such a short space of time.
Think of it. Imagine if Jews used their talents to evangelize, rather than achieving success in finance/banking, the sciences, and the arts.
The world would have converted to Christianity long ago.
Mysteriously, however, the majority of Jews rejected Christ, but the gifts of God remain.
But this, too, is part of God's plan.
See Romans 11:
>By their transgression salvation has come to the Gentiles, to make them jealous. Now if their transgression is riches for the world and their failure is riches for the Gentiles, how much more will their fulfillment be!
>...For if their rejection is the reconciliation of the world, what will their acceptance be but life from the dead?
>...They were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; for if God did not spare the natural branches, He will not spare you, either. Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off.
>And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again.
>...For I do not want you, brethren, to be uninformed of this mystery—so that you will not be wise in your own estimation—that a partial hardening has happened to Israel until the fullness of the Gentiles has come in; and so all Israel will be saved.
>all Israel will be saved.
-Romans 11:11-25