There are over 111 million households in the United States, earning an average of $50,000 per year.

Approximately 75% of Americans consider themselves Christians.

I doubt that 75% of households are Christian, so let's cut that down to 50% for arguments sake. 50% of 111 million equals 55.5 million Christian households.

If the average Christian household's income is also $50,000, and each of those gave 10%, a tithe, to their local church, they'd each give $5,000/year.

Still with me?

If all 55.5 million households gave $5,000 to their local church, the Church as a whole would have $277.5 billion annually.

Let's assume there are 40 million Americans without insurance. If that's true, the Church could buy them each a health insurance policy at $7,000 per year.