The morality of cloning

My sister contacted me today, asking my opinions on cloning (a topic of discussion in a book club she attends).

While I know this is a highly debated issue, I don't really know much about the subject. I couldn't recall any clearly defined objections to cloning, and couldn't think of any reason off the top of my head that I would object to it.

After a small amount of research and some discussion with coworkers, here is what I know:

There are three types of human cloning.
1. Therapeutic cloning (cloning cells from an adult)
2. Reproductive cloning (making a cloned human)
3. Replacement cloning (purely theoretical, would involve some combination of the above to regenerate limbs and body parts)

The most-discussed issue seems to be reproductive cloning.

The theory seems to be that a cell with the genetic material to be cloned is merged with an egg cell with it's cytoplasm removed.

Possible objections:
1. Cloning is unsafe at the moment. It is likely that many clones would die in the early stages of cloning before cloning became reliable.

This objection is not an argument against cloning itself being necessarily sinful, but it is an argument against experimenting with cloning.

2. Cloning crosses a line that determines how much control humans should have over their bodies.

This objection seems common, but is very vague. I have heard no good reason for drawing the line at cloning as opposed to organ transplants or artificial insemination with sperm from a donor.

3. There are few/no Biblically legitimate reasons people can give to actually have a child via cloning, thus it is not worth doing.

The third objection, like the first, does not make cloning out to be in itself inherently sinful. It does assume that there would not arise any situation where cloning would be justifiable, thus making it not worth researching.

I'm new to this issue, my opinions are young and have little substance as of yet. At the moment, I'm having trouble understanding why cloning has been singled out as being so objectionable. I would love to hear some good arguments (preferably Biblically supported) one way or the other.