Are you trying to convince me that the Vatican only has $3 billion of assets? C’mon.
What's stopping you from Googling it?
Time Magazine, no friend of Catholics and other Christians, puts it at $10-15 billion:
Bankers' best guesses about the Vatican's wealth put it at $10 billion to $15 billion. Of this wealth, Italian stockholdings alone run to $1.6 billion, 15% of the value of listed shares on the Italian market. The Vatican has big investments in banking, insurance, chemicals, steel, construction, real estate. Dividends help pay for Vatican expenses and charities such as assisting 1,500,000 children and providing some measure of food and clothing to 7,000,000 needy Italians. Unlike ordinary stockholders, the Vatican pays no taxes on this income, which led the leftist Rome weekly L'Espresso last week to call it "the biggest...
Notre Dame has an $8 billion endowment.
The Church practices what it preaches regarding the principle of subsidiarity.