Marianna wrote:
“God created Adam and Eve and they procreated Cain, Abel and Seth, so my bible tells me. How did procreation continue or was this just symbolism? Is this the reason at my Catholic Sunday service the priest says, “My brothers and Sisters”, as we all are related?”
Marianna, thank you for your question. I am sure that many others have similar questions and will benefit from hearing an explanation. I would like to break down my answer into two parts, because I think we are dealing with two different subjects. Your two questions are:
1) The Bible tells us that God created Adam and Eve, and they procreated Cain, Abel and Seth. How did procreation continue or was this just symbolism?
2) Is this the reason that the Priest says, “My Brothers and Sisters” at Catholic Mass, because we are all related?

I will begin with your first question: How did procreation continue or was this just symbolism?
Well, in order to answer this question, I will share with you two beliefs that I have about the Old Testament. First of all, I believe the Old Testament to be an accurate and inerrant document of recorded human history – meaning that I don’t believe that any of the stories of the Old Testament are merely symbolic. Now this is not to say that there is no symbolism in the Bible, but when you are talking about details and events and people, I believe these to be accurate. We can talk more about the 6 “days” that God created the universe, but I will save that discussion for another day.
My second belief about the Old Testament is that not every event and every person is recorded. I think that is a fair assumption we all can accept. So with these two beliefs in mind, I will try to help you to better understand the events following the creation of Adam and Eve (note: we will fast forward through the creation of Adam and Eve and Original Sin, if you want to know more about these topics, click here).
So how did procreation begin? The Bible breaks it down like this:
“Adam lay with his wife Eve, and she became pregnant and gave birth to Cain. She said, “With the help of the Lord I have brought forth a man.” Later she gave birth to his brother Abel.” -Gen 4:1-2
Now in case you haven’t heard, Cain was jealous of his brother, Abel, and decided to kill him (Gen 4:3-8). As you know, God is good, and He hated to see Adam and Eve mourning over the loss of their son, so He blessed them with another:
“Adam lay with his wife again, and she gave birth to a son and named him Seth, saying, “God has granted me another child in place of Abel, since Cain killed him.” -Gen 4:25
After Seth is born, the bible goes on to say that Adam had other sons and daughters and lived to be 930 years old (Gen 5:3-5). These verses are the only recordings of Adam and Eve’s children. But let us rewind for a moment…
Before the Bible even mentions Seth being born, it says that “Cain lay with his wife, and she became pregnant…” (Gen 4:17). So somewhere between Adam and Eve giving birth to Cain and Abel, and before the Bible mentions their next child, Seth, some other woman comes out of nowhere! What possible explanations can we give for this mystery woman? Well, the two options are: (a) God created her or (b) Adam and Eve had other children that weren’t mentioned in the Old Testament.
Going along with my original assumptions about the Old Testament, it would be fair to say that Adam and Eve had other children that weren’t mentioned in Genesis. This also conforms to the fact that women are rarely mentioned by name in the bible with the exception of major players like Ruth and Esther, and wives of major male figures like Issac and Jacob. These consistences would allow us to presume that the female children of Adam and Eve did exist, but weren’t mentioned. It is also more likely that this is the case, rather than God creating other people that aren’t mentioned by name (for more on this, click here).
So this brings me to the question I am sure you are hinting at: “Was Cain’s wife his relative?” Believe it or not, I think the answer is yes. So what does this mean for God’s view of incest? Well, in a similar way to polygamy, it seems that God allowed incest at the origin of the human race in order for us to fulfill his command to “Be fruitful and increase in number; fill the earth and subdue it.” (Gen 1:28) Unlike polygamy, however, God specifically forbids incest later on in Leviticus (Lev 18). This is probably due to the harmful biological effects that incest would eventually have if it continued and the fact that it was no longer necessary to sustain humanity.
Incest today leads to many birth defects because of an increase in genetic abnormalities caused by recessive genes. When two members of the same family procreate, there is a better chance of a shared recessive gene becoming a part of their child’s genetic makeup. In other words, it is easier to pass on disease and genetic mutations if both parents have the similar genetic code. This was less of a problem at the start of the human race because it takes many iterations of incest in order for the recessive genes to begin to become a problem. For more information of the effects of genetic ‘inbreeding’, click here.

Now for your second question: “Is this the reason that the Priest says, “My Brothers and Sisters” at Catholic Mass, because we are all related?
Although I am sure that many are confused about this terminology, it is actually a reference to several places in the New Testament in which Christ calls His followers brothers and sisters. Here are just a few as a reference:
“While Jesus was still talking to the crowd, His mother and brothers stood outside, wanting to speak to Him. Someone told Him, ‘Your mother and brothers are standing outside, wanting to speak to you.’ He replied to him, ‘Who is my mother, and who are my brothers?’ Pointing to his disciples, He said, ‘Here are my mother and my brothers. For whoever does the will of my Father in heaven is my brother and sister and mother.” -Matthew 12:46-50 (Mark 3:33-35)
“Do not rebuke an older man harshly, but exhort him as if he were your father. Treat younger men as brothers, older women as mothers, and younger women as sisters, with absolute purity.” -1 Timothy 5:1-2
I hope that these verses help clear up any confusion you may have been having with what your Priest meant by saying, “brothers and sisters”. Christ called us to treat each other as brothers and sisters, all of us sharing the same Heavenly Father.
Thanks again for your questions and hopefully my answers helped you to better understand these issues. Please feel free to ask more questions as they come up.
Thanks for asking!
-God’sWings