At the time, in Europe, atheism was simply not a permitted intellectual path to take. It was basically inconceivable. So nobody truly needed to "prove" God, and

At the time, in Europe, atheism was simply not a permitted intellectual path to take. It was basically inconceivable. So nobody truly needed to "prove" God, and the argument "works" for some thinkers because its presupposition and ends confirm what they already "know" to be true.