Paganism is generic term for entire set of completly unrelated religions all over the wolrd. With exclusion of Hinduism/Brahmanism in certain degree, there is no even coheren teaching about it, that's why all that Religions were defeated by Christianity.
There was no Europe before Christianity. European identity, European culture, European education, European medicine, European technology, all that have origins in Christianity.
Concept of freedom of religion is another Christian inovation. Christians, faced with legal requiremnts to recognise emperors as gods, were insisting on it. All earyl christian apologets wrote about it. Nobody is forcing you to believe something which you d not wish.
I am just reacting on nonsenses about existing European identity, culture etc, before Christianity. You may like it or not, bu it is fact.