After Mary and Joseph were married (Matt. 1:16; 19), but before they had sex (Matt. 1:18; Luke 1:27; 34), Mary became pregnant (Matt. 1:18). An angel appeared to both Mary (Luke 1:26-38) and Joseph (Matt. 1:20-23) separately to announce that the Holy Spirit conceived the baby (Matt. 1:20; Luke 1:35) and that the baby would be the Son of God (Luke 1:32; 35). Mary and Joseph did not have sex until after the child was born (Matt. 1:25). Per the instructions of the angel, the child was named Jesus (Matt. 1:21; Luke 1:31). The Virgin Birth serves as a miraculous sign from God that the Chosen One had arrived (Is. 7:14). Mary and Joseph raised Jesus on earth (Luke 2:48). Both Mary and His adoptive father Joseph are descendents of David (Luke 3:31; Matt. 1:6; 16), from which the King was prophesied to emerge (Luke 1:32; Jo. 7:42; 2Sam. 7:12; 1Chron 17:11; Ps. 89:3-4; 35-36; 132:11; Is. 9:7; Jer. 23:5).
I believe that without a proper understanding of the Bible, theology cannot be accurately developed, therefore within each assertion, you will find scripture references. I will post more as time goes on, but for now, if you have specific theological questions, please email me via the contact page.