First of all, the article is well written and does lay a finger on the issue.

 Secondly, there have been many who have been proclaimed messiah.  For example: Simon (ca. 4 BC), a former slave of Herod the Great who rebelled; Athronges (ca. 3 BC); Judas of Galilee (?), son of Hezekiah/Ezekias, a member of the Zealots faction who led a bloody revolt against a Roman census in AD 6. (JA18); Jesus of Nazareth (ca. 4 BC - AD 30-?), a wandering prophet and teacher who was crucified by the Romans; Theudas (? - 46), who attempted a short-lived revolt against the Romans before being slain. (JA20.5.1); Menahem ben Judah (?), allegedly son of Judas of Galilee, partook in a revolt against Agrippa II before being slain by a rival Zealot leader; Vespasian, c.70, according to Josephus[3] ; Simon bar Kokhba (?- ca. 135), founded a short-lived Jewish state before being defeated in the Second Jewish-Roman War; Moses of Crete (?), who in about 440-470, convinced the Jews of Crete to attempt to walk into the sea to return to Israel; he disappeared after that disaster; Ishak ben Ya'kub Obadiah Abu 'Isa al-Isfahani (684-705), who led a revolt in Persia against the Umayyad Caliph 'Abd al-Malik ibn Marwan; Yudghan (?), a disciple of Abu 'Isa who continued the faith after Isa was slain; and more.

 Many Sages were involved here too.  If determining who messiah is or will be is clear cut and simple, why all the confusion?

 The bottom line is that many attrocities were visited upon Israel in the name of Jesus.  This is difficult to overlook.  However, as we can see from the article, some of those Jews who believe in Jesus do hold on to their identity and practice.  Those who do should not be turned away from klal Israel.