He is believed to be the Jewish messiah who is prophesied in the Hebrew Bible, which is called the Old Testament in Christianity. It is believed that through his Crucifixion and subsequent Resurrection, God offered humans salvation and eternal life, that Jesus died to atone for sin to make humanity right with God.
the whole reason texas wanted independence from mexico was that if you moved to texas you had to convert to catholicism. anglos were mostly christians and wanted religious freedom