[xzins]

5. The soul which recommends itself to me by the recitation of the Rosary shall not perish.

Since Our Lady is our Mother and Advocate, She always assists those who call on Her implicitly by praying the Rosary. The Church reminds us of this in the Memorare prayer, “... never was it known that anyone who fled to your protection, implored your help or sought your intercession, was left unaided ...”

[Titanites]

I asked which church makes it a “necessary practice”.

[Titanites]

Maybe you misunderstood. I asked what church teaches it as a doctrine? and What church makes it a necessary practice?

They're pretty easy questions really, but you seem to be incapable of answering them.