I don’t think you got the central point. Protestants exist to protest Catholicism. A Protestant that recognises catholics as Christian’s wouldn’t be a Protestant.
Different sects of Protestantism are able to recognise other sects as Christian’s because a central tentant of Protestant practice is the personal relationship with God. So different sects of Protestants find that easier to accept. Where as Catholics practice a relationship with God that is tied to the organisation and the Pope.
Mormons are arguably a different religion altogether. Similar to how Jewish/Christian/Islam all share similar but different religious texts making them all different religions.
The intended outcome is othering.
You misunderstand reasonable. It does not mean good, more the natural conclusion given the context.
No, it’s better because Google can validate that it’s your information so they can use it to sell better targeted ads for more money. Or more pessimisticly sell that info to other companies/countries/scammers.
You take all the risk they take all the profit.