The ethical issues here have nothing to do with abortion.
With abortion, the fetus lives a "normal life" until, one day, you decide to put an end to it. If you think that a fetus is a real live human being (as do certain religions), then abortion is murder. If you don't think this, then abortion is more like plastic surgery for the mom, or at most, like putting a pet to sleep when you can no longer take care of it. In short, momentary pain which is justified by other needs.
With this brain, the problem is not ending a life, but the life itself. If this brain were indeed conscious, it is not having a "normal life". It could be in a continual state of stress and panic due to not receiving the sensory input it expects. Keeping it alive could mean subjecting it to nonstop emotional torture. That's not a specifically religious concern - anyone who cares about not inflicting pain should be bothered by it.
This brain does not show brain waves, so it's probably not conscious. But the next brain this group develops will be more developed. So we need to figure out how to morally safeguard this kind of research, sooner rather than later.