Paganism declined rapidly in the first place. It remains both smaller in number and growth than Christianity. Christianity is still increasing in number every year.
Your arguments sound no different to third workers who complain about European colonialism.
Your pagan idols weren't victorious against Christianity though. Otherwise they wouldn't have all converted to it. Instead Christianity grew like no other faith ever has and became the dominant religion of Western civilisation.
Paganism should've offered a better and more convincing religion that Christianity then, otherwise they wouldn't have all converted. If you believe in "the law of the victor" instead of objective morality, then surely you would agree with that? Christianity has undoubtedly been victorious over paganism because all the pagans converted to it. The remarkable success of Christianity's spread and its ascension into the predominant religion of Western civilisation has been like no other.
