I did not say there was no difference in beliefs. I said they both were religions based upon writings by men (or God) that must be accepted by faith, and cannot be proven. Anyone can prove that events that happened and are also written about in the Bible, that does not mean the doctrines are proven. If anyone claims that archeology proves your version of religion is wrong, it can only prove that the history is correct. Religion or doctrine are taken on faith, not proof.
You asked why were there attacks on mormonism...the reason is because Christians believe mormonism is a false religion. What you believe about religions in general is irrelevant. If you don’t want Christians to attack the teachings of mormonism, then too bad.