Machine Learning and Deep Learning(neural nets)

"If you know Machine Learning, then you will not believe in Deep Learning(artificial neural nets). If you believe in Deep Learning, that means you don't understand Machine Learning" The word'believe'.....i used it in a totally an informal way, in the sense that, "I dont believe means, I dont accept it as a theory"....and don't want it to have any bearing on its practicality. I clarify, I am not in anyway intending to say that they are not practically useful, infact they are in much vogue in many practical applications, which everyone knows. I am talking in a theoretical sense, some things we cannot accept as a theory in some abstract sense, although they may be very useful in parcticality. By using word, "believe" i mean "accepting as a theory", and not bearing anything on practical engineering significance.