You need to be a hardcore athiest to put up a good its not a life arguement and im not even a Catholic.
No you don't, you just need to understand the law. Regardless of your personal opinion the law allows abortions upto 24 weeks.
People far more qualified than you or I have decided upon that and given that religion pretty much has no base in law, atheism or any form of 'ism doesn't really apply.