as of end (of)

The whole phrase is junk. "As of end (Month/Year)" is terse jargon as seen in US accounting reports, etc. It has no place in decent prose.

This is better:

We had converted forty people to Christianity by the end of November this year.


BUT- It is "God" who converts people to Christianity, not people. (If you believe in God. I don't.)

So...

We had forty conversions to Christianity by the end of November this year.

Many thanks, Contrex.