How do those Christians who believe that believers' partaking of the divine nature that Apostle Peter was talking about in 2 Pet. 1:4 is possible only through Eucharist prove that? What are their main arguments supporting that notion?
2 Pet 1:4: "Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust." (KJV)
I am not sure if the concept of Eucharist being the exclusive way of partaking of the divine nature is a must belief in any one branch of Christianity. It is most likely that in each branch there could be found both proponents and opponents of that belief. However, in my question I am primarily interested in the arguments of RCC, EOC and main-stream Protestants.