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Dug for some figures in Internet, it appears that I was wrong a little bit.

There are about 8% of Muslims live in Russia.

About 30% consider themselves non-religious and another 6% are atheists...

No, I'm not, but here are the regions that have substantial numbers of muslims living there:

Адыгея
Алтай
Башкортостан
Дагестан
Ингушетия
Кабардино-Балкарская
Калмыкия
...

I am saying only that about one third of the population live in so called Muslim Republics. Many ethnic Russians live there too.

And... there is a difference between considering oneself a...

To be honest I haven't a slightest idea about differences between Greek, Eastern European and Russian Orthodox churches.
As far as I know they recognize each other and titles of the patriachs. I...

I think it's the first link you visited but just in case you need it here it is:

http://en.wikipedia.org/wiki/Avvakum

Follow the links in the bottom.
If you know Russian well enough you can...