It seems like the article overemphasizes the similarities and ignores some key differences. The fact that the author says there are "seemingly" irreconcilable differences makes me very suspicious that we are dealing with some kind of syncretism. For instance, Buddha-nature is immanent and is the nature of every sentient being- this is different from God who is active in his creatures but ultimately transcendent and unattainable. No one can become God in his essence, but in Buddhism, human beings can become fully Buddhas. Also, Buddhist cosmology is cyclical- there are infinite cycles of time, and infinite beings being reborn, in infinite worlds, through both the past and future. The Christian cosmology is basically geocentric and understands that the universe (and time) were created at a particular point in time, and will end at a later point.