Well opinions aside, thats what Jesus said...and if one were to "challenge" Him on that by testing that...they will find out for sure. Some of us have.

This question is sort of like saying 'how much money do I need to invest'
The answer depends on how much return you want. It only takes a penny.
And like investing, when one recieves that return he will only wish to invest more. Why? Because in THIS system unlike money markets, you never lose.
Another key difference in investing faith as opposed to money is the rate of return.

But those who never invest will never know.