Do you believe in the law of cause and effect?
Short answer: No, I do not.
Long answer:
I believe that this specific descriptor has been sorely abused, even right here in these forums, and should be avoided for a while so that misunderstandings are not created.
Specifically, I have seen it raised in an attempt to claim that existence itself must have a (transcendental) creator. I do not see why, nor how that would even be a true or useful answer.
Besides, isn't it a bit contradictory to want to demonstrate a transcendental being as a consequence of the law that he is not subject to? That strikes me as rather pointless.
If anything, it would demonstrate that it is not possible to know logically whether there is a creator of existence itself. Personally, I don't think it goes even that far.
I also believe that in reality causes and effects tend to be far more complex than we give them credit for. Most effects are the result of a whole set of causes, working with and against each other in complex arrangements. From a religious perspective, much of the role of wisdom is learning to get a grip of the flow of those sets of causes and working with them.