Which religion is considered having the most ...

There are more then a billion Christian believers who mainly dived between orthodox, protestant and catholic. Because they share many core beliefs and they use the same texts you can say they are all a part of one faith.

http://en.wikipedia.org/wiki/Image:Major_religions_2005_pie_small.png

I don't know whether this question has an answer.  But I do have a few thoughts about how to narrow down the possibilities.

The religion with the most observant believers would likely congregate in small communities.  The religion's adherents would be distinctive from anyone else who lived in or visited the community, based on aspects such as language or dress.  In addition, membership in the religion would require residence in the community (or another community of the same religion).

I have in mind a group like the Old Order Amish.  But perhaps somewhere there is a religion whose members are even more observant than the Amish.

"Blind belief" can also be seen as "faith."  It depends on one's point of view.  Personally, I feel that it can be inspiring for people to believe in something, in a day and age when belief is unfashionable.  As long as the belief causes people to be better human beings (more kind, generous, etc.), then I'm in favor of it.

I guess that depends on what you mean by observant.What really makes a man observant?Is it rituals ,chanting,robes and the other trappings or is it something inside that takes your faith and makes it the guiding star of your existence?I would say that true observance comes from a faith that transforms every aspect of your life.Such a faith will not be evident by appearances - but by how a person lives.How can statisticians ever quantify that?Good luck!

Uma is right.  There is only one church -- everyone who accepts Christ as their savior.  I don't care what congregation you attend -- one building would be hard for everyone to get to and on any day we chose to worship, it would be very crowded. 

The idea is to live the life of love and kindness.  Most religions accept this. 

A religion I used to belong to demanded the death of unborn infants.  They got a lot of recognition if they had amniocentesis done, and if the baby was male, they got an abortion like he was a cancerous growth.  That's what they call boys and men too.  I didn't know what they actually believed until I joined, then when I found out, I had to choose between my personal safety and saving my soul.  I know a lot of girls who died a week or so after leaving that evil cult and I have received a lot of threats myself.

This is why I have nothing to lose by speaking out against my former religion, feminism.

I am a Christian now.  Go ahead feminists, make more threats.  Put more bullets through my door.  Spread more lies if you want to!  Wake me up at 3:15 AM every morning with subliminal message tapes.  Put my name in your "sellouts and traitors" column.  Go ahead, make me a martyr! 

I have the feeling that God will take into consideration what you have done when you come to trial.

Raydan, the two cults I know of that have the blindest "true believers" are atheists and feminists. 

My parents were atheists, they fought incessantly, they had the lowest moral and ethical code I have ever seen past hardened criminals in prison, and they annoyed everyone with their reversed religion.  Atheism is a religion of abject faithlessness, but it is a truly fanatical religion and they are out to pressure everyone into joining their religion by any means possible.

Another choice little cult is feminism.  It goes along with atheism in that they look for "alternates to faith" any way that they can.  They'll preach the Tawanda cult, Ramatep cult, Thuggee cult, or any other matriarchal cult that demands bloodshed of the male gender, or using the male gender to act out that bloodshed as expendable weapons of hate.

I love love and disregard hate.

You should too.

Religion is what a person believes in and God is not a religion but God is the creator and Jesus is the only door and your only Hope! religion does not rely on love, as God said you praise ME with your mouths but your Hearts are far from Me! there are only two choice's in life being in the family of God the Father and if your not then your father is satan the Devil  there is no in between! Life=Jesus the Christ; and life lost for eternity=Satan the falling Cherub!