It does not matter what they were. They were leaving for a higher purpose than the establishment of one particular religion. They were leaving for religious freedom, which is much more noble than leaving for one particular religion.
And I, for one, thank them for their noble purpose. I can practice my Judaism unmolested and freely, with no fear.
Why, they felt so strongly about religious freedom, that they wrote "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof"
Too bad for you, that you can't change history.
The mutual warfare of Christian sects in the two centuries after that fellow tacked his list onto a church door forced them to come to a modus vivendi of toleration, which was gradually extended to religions generally. This is not a result of "Christian morality"; it is a result of the political circumstances in which Christians found themselves after fighting one another to a standstill.