how do you believe that their is air in this world? no one has seen it. but how do they believe? they believe because they are able to feel it. similarly those who have experienced God in their lives due to God answering their prayers or showing some visions or speaking to them or someother means... believe that God exists and answers to their prayers.
so don't say that there is no air since u are not able to see it. try to seek the truth deligently and you will find that.
I don't know what u believe in - the scientific theories of evolution or ??
FYI, that Jesus will be born of a virgin was prophecised many hundred years ago by prophet isaiah as mentioned in bible. so, during that time many jewsish women wanted Jesus to be born of them and dedicated their lives for spirituality and didn't marry praying that Jesus be born of them. one such holy woman was mary and God chose her to bring Jesus to this world. This is the miracle in the birth of Jesus.
Since Jesus rose from his grave and is alive even today He still answers to our prayers and cures the sick, the lame, the deaf, the dumb the blind and no matter what the sickness is. that is people who have experienced this believe that Jesus is alive and answers their prayers.
