Does God will the diversity of religion? According to this article: Pope Francis signed a document stating:


  The pluralism and the diversity of religions, colour, sex, race and
  language are willed by God in His wisdom, through which He created
  human beings,


The article says:


  theologian says it must be read in the proper context


The context is:


  Catholics, Muslims and all who believe in God must work together to
  build a culture of love, peace and human fraternity


My question is how does the Catholic Church understand it within the context of the first commandment? Is this the teaching of the Catholic Church that diversity of religion is the will of God?


  I am the LORD your God, who brought you out of the land of Egypt, out
  of the house of bondage. You shall have no other gods before me. You
  shall not make for yourself a graven image, or any likeness of
  anything that is in heaven above, or that is in the earth beneath, or
  that is in the water under the earth; you shall not bow down to them
  or serve them.3 It is written: "You shall worship the Lord your God
  and him only shall you serve."4 Catechism
No, the diversity of sects is due to the sin of man.


  2 Peter 2:1But there were also false prophets among the people, even as there shall be among you lying teachers who shall bring in sects of perdition (αιρέσεις απωλείας) [lit. "heresies of perdition", false religions] and deny the Lord who bought them: bringing upon themselves swift destruction.


All false religions begin with false teachings. For example: Judaism denies Christ is the Messias. Islam denies Christ's divinity and thus also the Trinity. Protestantism denies the visibility of the Church, the ministerial priesthood, the transubstantiation, and that the Holy Sacrifice of the Mass is truly a propitiatory sacrifice.

God does not will that believers mingle with non-believers:


  2 Cor 6:14-16Bear not the yoke with unbelievers. For what participation hath justice with injustice? Or what fellowship hath light with darkness? And what concord hath Christ with Belial? Or what part hath the faithful with the unbeliever? And what agreement hath the temple of God with idols? For you are the temple of the living God: as God saith: I will dwell in them and walk among them. And I will be their God: and they shall be my people.


See also "The Church's Constant Teaching on our dealings with Non-Catholics."

Religious indifferentism and liberty of conscience is a heresy. Bl. Pope Pius IX condemned the following proposition in his Syllabus of Errors:


  
  Every man is free to embrace and profess that religion which, guided by the light of reason, he shall consider true.