Since faith is a gift, God can create it in the heart of a child just as much as He can create it in the heart of an adult. There is so much wrong with this argument that it is difficult to know where to begin in reviewing it. A comparison is not made with itself. The Lord then speaks of tender believers, who are child-like in disposition, and warns against causing such a one to stumble. Faith is a gift from God only in the sense that the Creator provides the evidence for the generation of faith, and so, provides us with the opportunity to believe.
Faith is rather similar to repentance.
Some appear to give no forethought to the consequences of their arguments. These are two sides of the same coin. It is certain they cannot interrogate them. Many Lutheran scholars have been honest enough to acknowledge there simply is no evidence for infant baptism in the New Testament. Quotations of this nature could be multiplied many times over.