You can easily know the father of the child by dna test. This is not written in koran?
DNA can give estimated results not accurate.
DNA tests can exclude with 100% accuracy and include with 99.99% probability. That's enough in my book. (My book is science.)
They define it as probability. Yes, it can tell who is your father sometimes but not all time and you will have to rely on probability mostly. When paternal parent issue comes, when 4 husbands are invloved, it is not that easy. Also think what they will do if more than one sperm fertilizes the egg? It is very complex and lead to complex situations. This can theoretically be enough but practically it isn't.(not always)
Yes, they define it as probability because that's what it is. Only in religion do they teach you a "fact" that is not a fact. I also don't think you understand 99.99% probability. They can only establish 99.99% probability of who your father is as well. Do you think he is not your father because they can't say 100%?
Two sperm from different men cannot fertilize the same egg. It's biologically impossible. You are not countering scientific facts with anything credible.