most philosophers have found the argument unpersuasive

most philosophers have found the argument unpersuasive, but actually refuting it turned out to be fiendishly difficult. Even Bertrand Russell admitted that 'it is easier to feel convinced that it must be fallacious than it is to find out precisely where the fallacy lies'

J. Hannam, God's Philosophers (2009), 45
On Anselm's ontological argument