Personal Identity depends on Consciousness not on Substance - John Locke

...when I had gone through the whole, and saw what a plain, simple, reason able thing Christianity was, suited to all conditions and capacities; and in the morality of it now, with divine authority, established into a legible law, so far surpassing all that philosophy and human reason had attained to, or could possibly make effectual to all degrees of man kind; I was flattered to think it might be of some use in the world; especially to those, who thought either that there was no need of revelation at all, or that the revelation of our Saviour required the belief of such articles for salvation, which the settled notions, and their way of reasoning in some, and want of understanding in others, made impossible to them. Upon these two topics the objections seemed to turn, which were with most assurance made by deists, against Christianity; but against Christianity misunderstood. It seemed to me, that there needed no more to show them the weakness of their exceptions, but to lay plainly before them the doctrine of our Saviour and his apostles, as delivered in the scriptures, and not as taught by the several sects of Christians.

"but freedom is not, as we are told, " a liberty for every man to do what he lists:" (for who could be free, when every other man's humour might domineer over him ?) but a liberty to dispose and order as he lists his person, actions, possessions, and his whole property, within the allowance of those laws under which he is, and therein not to be subject to the arbitrary will of another, but freely follow his own."

In the second place, the care of souls cannot belong to the civil magistrate, because his power consists only in outward force; but true and saving religion consists in the inward persuasion of the mind, without which nothing can be acceptable to God. And such is the nature of the understanding, that it cannot be compelled to the belief of anything by outward force. Confiscation of estate, imprisonment, torments, nothing of that nature can have any such efficacy as to make men change the inward judgement that they have framed of things.