So you are willing to have a State-permitted religion as long as it meets your preference for "small  neighborhood churches which are often poor".  

How much money can these State-authorized churches make before they have to pay for the privilege of being a State-authorized church?  Is there a salary limit for the pastors?  How about for deacons if they have them?

How is it determined?  And by whom? 



Who is going to be your religious czar?  Who selects the czar and under what standards?

When a religion gets to a couple hundred thousands members, does it then have to pay taxes to exist?  Or are there other rules?

Iran's theocracy has to approve every political candidate as being authorized to run for office.  

You are just requiring every church to meet your preferences for tax relief.  

Same principle.  Just the other side of the coin.  The Church has to be of a size and poverty level you like. 

You are 'establishing' a church by your standards.  First Amendment says "NO".