According to the Law of Biogenesis, life arises only from preexisting life.
If you say that there was no first cause (a Creator), then you are stuck with the unscientific and thoughtless belief that nothing created everything. So, what is it that you believe? Is it that something created everything? Then you are not an atheist, because you believe in a Creator.
Sadly, I have found that even evolution's most staunch believers are afraid to debate, because they know that their case for atheism and evolution is less than extremely weak.
This society in which we live is radically changing. What previous generations saw as evil is now embraced as being good. It is a dangerous and slippery slope upon which we stand when we reject what Solomon called the beginning of wisdom - the fear of God.
According to the Bible, sex isn't something sinful, but rather a wonderful gift from God to be thoroughly enjoyed within the boundaries of marriage.
I am surprised that anyone can profess to be an atheist.