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.)
We can consider a science a sort of religion, and a religion a science. I can believe in them, but you can believe only in one (science) I suppose you are not a religious person.