You are a Jewish Christian, a Messianic Jew.
So you believe that Jesus is the Jewish Messiah, the chosen, anointed one.
You also believe as a Messianic Jew that Abraham is the father of many nations and a covenant was made with his one seed, the Messiah, Jesus. Making all those in Christ the children of Abraham.
Including converted Muslims.
Young's Literal Translation
Gal 3:16 and to Abraham were the promises spoken, and to his seed; He doth not say, `And to seeds,' as of many, but as of one, `And to thy seed,' which is Christ;
Gal 3:28 there is not here Jew or Greek, there is not here servant nor freeman, there is not here male and female, for all ye are one in Christ Jesus;
Gal 3:29 and if ye are of Christ then of Abraham ye are seed, and according to promise--heirs.