I know that cloning research and tech is in its infancy. However, I believe its advancement and eventual prevalence is an inevitability. And that would be my approach to the argument. Show how each new technology that was railed against as being an affront to some fictional god has always moved forward without much hindrance. Track cloning R&D progress. Perhaps there's a logarithmic increase that would reflect said inevitability. Based on progress made, questions answered, and new problems revealed you may be able to simulate an expected set of milestones in the future. Cloning: A Timeline of Progress to Come or something like that.
I did a report on cloning some years ago when I went back to school. Here's what I remember. A female embryo would be required, but I forget what is done to it beforehand. The genetic material, after whatever process has to be done first, of whatever is being cloned would then be inserted into the embryo. Now, the level of success varies though. Dolly was a successful clone, but the scientists went through hundreds of embryos and defects before Dolly.
Some successful cloning of animals has been accomplished. In my opinion, animals have souls. Souls are like fingerprints. No two souls are identical. If those clones exhibit emotions, self-awareness and personality then proof of souls has been seen.