:All Protestant churches accept the doctrine of “Sola Scriptura,” the Bible as the SOLE source of authority for believers.:
This is false. For one thing, not all definitions of sola scriptura would say that the Bible is the sole source of authority–more generally, it would be defined as saying that the Bible is the sole infallible source of authority, or the sole source of divine revelation, or something like that. And many Methodists and Anglicans would flatly deny that they believe in sola scriptura. We Anglicans (and by extension also Methodists) do believe in the “formal sufficiency” of Scripture, so if that counts as sola scriptura then we believe it. The thing is that many Catholics also teach formal sufficiency and distinguish it from “sola scriptura.”
: Although Protestants voluntarily submit to denominational and pastoral authorities and written statements of faith, they all believe that if these human things (pastors, statements of faith) etc. are in conflict with the Bible (or if they perceive that there is a conflict!), they are free to leave that church and seek another with no danger of loss of salvation.:
Not all Protestants would take it quite that glibly.
:One more thing: to the Protestant, the large numbers of denominations is not bad, but good.:
Again, that is definitly not true of all Protestants.
:Also, Protestants do not see “the Church” as having anything to do with their salvation or their relationship to Jesus.:
Also not true of more traditional Protestants.
:And although some of the mainline Protestants have some of the sacraments:
No, practically all Protestants have two sacraments, although the more radical Protestants may not call them sacraments. What Protestants are you thinking of who don’t have sacraments? Quakers? Salvation Army?
: (Communion, Baptism, Confirmation, Marriage, Anointing with oil for healing), they do not feel that these Sacraments are vital for our salvation and our sanctification, as Catholics do.:
Not true of the “more mainline Protestants,” to use your terminology. At least, it isn’t true of Anglicans, Lutherans, or many Methodists. The Reformed might cavil a bit at saying the Sacraments are vital, but the more traditional ones would in fact believe that in the sense Catholics do (i.e., that they are the normal means of grace)–they tend to be paranoid about a “magical” understanding of the sacraments that in fact no church officially teaches.
: Keep all this in mind when you talk to Protestants. The very idea of a “mother” church is totally foreign, even idolatrous, to Protestants.:
Yet again, this is only true of some Protestants. Calvin, for instance, spoke of the Church (the visible Church) as our mother, outside of whom there is no salvation.
As for the general definition of Protestant, I would say that a Protestant church is any church that separated from the Western Catholic Church at the time of the Reformation (Lutherans, Anglicans, Reformed, and Anabaptists), split away from such a church later (Baptists, Methodists, Restorationists, Pentecostals, and a host of others), or came under formative influence from a church that was Protestant in one of the first two senses (Hussites, Waldensians, and various Eastern European groups, though possibly we could count the Hussites/Moravians as Protestants in their own right). Another way of putting this is that all Western Christians who are not in communion with Rome and are not some kind of “Old Catholic” or schismatic traditionalist group are Protestants. By this definition, being Protestant does not involve any specific doctrinal commitments, though sola scriptura in some form, and less universally some form of sola fide, are pretty constant throughout.