The aliens accept the Biblical teachings without reflection, as if carried by some magic in the mere words. The authors fail to make the Conversion anything but a simple-minded fundamentalist dream that begs the reader's suspension of disbelief and undermines any potential that the story might have. Fundamentalism is a difficult issue. To begin with, the word itself is a misnomer. Could be, but it is, more importantly, a political idea.
Fundamentalism is a political expression of spiritual belief, hardened into dogma.
It is Church as moral government. The personal mysticism at the heart of spiritual matters is put at the beck and call of a politically based filter of the metaphor of scriptural teachings for purposes of organization. Fundamentalism is religion as ideology, directing the faithful to embrace a shading of religious belief and values in the way an ideological political party embraces the State. The faith at its core remains true, but is used, at times cynically, to create identity, a group, a political agenda, and the leaders and the led. It is the normal function of the Church taken to extremes, emphasizing ideology and organization over inner spiritual growth.