In the days of his flesh, Jesus offered up prayers and supplications, with loud cries and tears, to him who was able to save him from death, and he was heard because of his reverence. Although he was a son, he learned obedience through what he suffered. And being made perfect, he became the source of eternal salvation to all who obey him, Hebrews 5:7-9 (ESV)
Stephen does respond to the underlying charge that he is a renegade Jew, and by extension, that the Messianic church is composed of apostate...
For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness,...