Yup ... an observant "orthodox" Jew, he was and what we call "Christianity" was a Jewish sect food about the first 300 years, or so.
Ummmm No!!!
1) Jesus identified himself and his associates as Israelites, and his mission was directed to the House of Israel. He was identified by other Israelite insiders according to his Israelite family and lineage and by his place of birth and upbringing, Nazareth and Galilee. He was Yeshua bar Yoseph, an 'Israelite', a 'Galilean', a 'Nazarene from Nazareth of Galilee, but not a 'Judean' resident in Judea.
(2) Jesus never called himself a Ioudaios and was never designated as such by fellow Israelites. He was called, or thought of as, a Ioudaios only by non-Israelite outsiders whose terminology was consistent with Hellenistic and Roman practice, designating as 'Judean' all residents of Judea, together with all those connected to Judea by blood relations, Torah allegiance, patriotism, and loyalty to Judea, the holy city of Jerusalem and the Temple.
(3) His first followers were identified by fellow Israelites also as 'Galileans', 'Nazarenes', or members of 'the Way', but never as 'Judeans'.
(4) They too, like Jesus, viewed themselves as Israelites. They preferred 'Israel' and 'Israelite' as self-identifiers when speaking to the ingroup Israel and when addressing fellow disciples.