HMmmm...
Your founder wasn't of your mindset.
We are constantly instructed not to criticize the religions of others. We teach our own doctrine, and the foundations for it. We also teach the historical apostasy — the same apostasy that give rise to your Protestantism. And then we teach, not just “protest” against said apostasy, but restoration of the church Christ established.
When we speak of “apostasy,” we have a very specific meaning. We mean the changing of fundamental doctrines ultimately resulting in the loss of priesthood authority which Christ had bestowed on his apostles. The restoration includes the restoration of priesthood authority and ordinances.
But we don’t mean by “apostasy” that the Light of Christ was gone out of every good person attempting to follow Christ, through whatever sect of Christianity exists. Much truth remained after the apostasy, but not all, and no authority.