I don't think I really have to comment how an argument from silence proves nothing, either. (religion.blogs.cnn.com)
See also: I'm thankful Rod Dreher has taken on their ridiculous «argument from silence» so I don't have to. (firstthings.com)
It seems to me that they didn't believe in Christ for eternal life (but that is an argument from silence so I'm not 100 % sure) but nonetheless believed him to be the Messiah. (redeeminggod.com)