If you have the understanding to convince somebody of the Jewish faith to partake in a Christian Baptism, then I would say, you have a knowledge set in belief.
I have been offered a dvd that is a 3 part doco, which includes something on God, 119 and Money. I haven't watched it and what I hate is that discussion on forums, to the like of this one, may have already informed me of its content. I am shutting the mind off from the topics so I might gain something from the feature.
A mistake in refferencing Christians and Christianity is knowing when the two are in no direct relation to each other. I would suppose this could apply to most religions and even some science. Truth, belief, fact, hypothesis, variation, law, etc... , there is little guarentee, that much of it is insolvent. Tomorrow we may learn that today we are wrong and yesterday remains unrepentant.