Just be clear the "sin" is not the child inside of you. Since you believe in sin, the sin is the mistake that you made, and we all make them, some bigger, some smaller mistakes. A child is never a sin (I am not saying thats what you meant but am not sure), please do not raise this child to believe he/she was a mistake, etc. Its a hard one and will be hard consequences...as mentioned in an earlier post...I also have a child I term "born out of wedlock", or in recent years simple "we never married". In the end, even though some questions will be asked over the years...it really is up to your inner security, self acceptance and mind set that will determine how your child feels about themself as they grow older.
The hardest will be finding a reason as to why his/her dad not involved in their life...that will be tricky and I suggest at some point getting some counseling for yourself as to how to frame that with your own integrity, and how to advise your child.
Is the father totally opposed to a relationship with the child? I would go so far as to suggest counseling with the father, before the birth to sit down and have a mediator/counselor present to get super clear on what involvement he will have. If he's iffy, clarify that...
If dad plays no role, you are free to meet other men, as came up in posts, and get married and have a more normal family life. I firmly believe it is possible for a single mother to raise a healthy child on her own, and there does not have to be taboo's around that, except the ones we project as a parent....outside of the few taboos that will come up in society...and there are fewer and fewer.
I feel very sad for my daughter sometimes, mainly because I conceived her with a boyfriend who was very difficult, and has remained difficult not just for me, but for her also. Because he is super involved in her life, there is a lot of conflict for her! That is MY mistake, she is still a blessing and I only hope and pray that what some elders have told me they have witnessed, at the least many of these children grow up to be very sensitive and caring people. It does not do me any good to bang my head against the wall anymore, not after 9 years...its counterproductive to living and teaching a positive life for both of us.
I don't believe in guilt, remorse maybe, as long as too much time is not dwelt there. Whats done is done and now there is a human being to raise yourself up to and teach the best of life. With the dad being completely hands off, it sounds like, you have major freedom to expand yourself and give your child the world....it can be a very positive situation.
I would still work out with dad a monetary contribution on a regular basis...even if its towards a savings account for the child....thats just my opinion.
Thanks for listening.