Can I be Christian and Jewish at the same time?

As commonly used today, the term refers to people of Hebrew descent and others who have been converted to Judaism. ”
Few are religious. For many, being Jewish is simply an ethnic designation.
As a nation, the natural descendants of Abraham rejected Jesus as the Messiah. And in the years following Jesus’ death, it became clear that there would be no wholesale conversion of Jews to Christianity. Still, Paul’s statement that ‘all Israel would be saved’ was true. In what way?
What It Means to Be a Christian. Jesus extended the invitation to be his follower, saying: “If anyone wants to come after me, let him disown himself and pick up his torture stake and continually follow me.” (Mt 16:24) Those who are true Christians have full faith that Jesus Christ is God’s specially Anointed One and only-begotten Son, the Promised Seed who sacrificed his human life as a ransom, was resurrected and exalted to the right hand of Jehovah, and received authority to subdue his enemies and vindicate Jehovah’s sovereignty. (Mt 20:28; Lu 24:46; Joh 3:16; Ga 3:16; Php 2:9-11; Heb 10:12, 13) Christians view the Bible as the inspired Word of God, absolute truth, beneficial for teaching and disciplining mankind.—Joh 17:17; 2Ti 3:16; 2Pe 1:21.

For more information on this subject and others, please go to the source jw.org official website. "Online Library." Also for free downloads or read online. You can read online the book "What Does The Bible Really Teach."