Why Fake It?

One of the things that I find utterly detestable is that Christian missionaries will take on various false identifies to convert Jews. If you truly have a strong argument for your beliefs, no false identify is necessary. For instance, 60 active missionaries were caught who had lied their way through the Jewish conversion process:
http://www.israelnationalnews.com/News/News.aspx/132271

Here is an article on a missionary who was caught pretending to be Hasidic:
http://www.israelnationalnews.com/News/Flash.aspx/175721

If this is the best way that some Christians find to reach Jews, then this truly speaks horribly about their own belief in Christianity.