Full Idea
Pascal's argument is valid, but it is presented with a monstrous premise of equal chance. We have no good reason for picking a half as the chance of God's existence.
Gist of Idea
Pascal is right, but relies on the unsupported claim of a half as the chance of God's existence
Source
comment on Blaise Pascal (Pensées [1662], 418 (233)) by Ian Hacking - The Emergence of Probability Ch.8
Book Reference
Hacking,Ian: 'The Emergence of Probability' [CUP 1975], p.68
A Reaction
That strikes me as the last word on this rather bizarre argument.