The question is whether we think we have free will. For to believe in astrology, this means that the date and place of birth are key elements of our characters, but it would also mean that all people born on the same day in the same maternity, and this happens, have the same character . This should be the case for twins, true or false, but that has not obvious in reality. Then why bring in the date of birth can be caused for many reasons with its normal expiry date.
If affects the positioning of the stars had to be the cause of our nature, it should be when life is created, so when, after coitus between parents, one sperm enters the egg and fertilizes , when cell division allows the creation of an embryo which develops to a baby.
Certainly the environment at birth relies on our lives. But the reason is that it determines a large part of our education and our training that will occur on the way we think and react to events that we encounter in life. Some learn quickly to make decisions and take their actions, even take hits, others take refuge to the decisions of those around them and leave gradually jail while complaining of not being free .
But like everything is not black or white, we are in fact intermediaries of all possible cases. When astrology seems to confirm that we match the type of our zodiac sign, it may push us to continue in this direction. But as the Ascendant can correct in a different sense, it also helps to explain why we are not a typical example of the main sign, but the result of a mix between the education received from our parents, society, the period and the country we live in, the people we meet, etc.
So I think it is only possible to live without seeking an explanation, following the principles we believe in and respect for others who think otherwise.