The answer would most likely be, "God chose that particular sperm" or the "freewill" argument. God wanted all the little spermies to have freewill blah blah no it couldn't be biology and natural selection, no.
Many people can find themselves becoming deconverted when they compare the teachings they find in one book to the contradicting teachings found in a library books. This meme illustrates how some religious people can be narrowminded.
Selectively choosing certain parts of the Bible, Koran/ Qur'an or Torah and forcing others to adhere to your beliefs while you blatantly ignore inconvenient parts of your book makes you a hypocrite - and shitty human being.