Here are the ellipses restored:

But because, as the wise man Solomon saith, Wisdom entereth not into a malicious mind, and that knowledge without conscience is but the ruin of the soul, it behoveth thee to serve, to love, to fear God, and on him to cast all thy thoughts and all thy hope, and by faith formed in charity to cleave unto him, so that thou mayst never be separated from him by thy sins. Suspect the abuses of the world. Set not thy heart upon vanity, for this life is transitory, but the Word of the Lord endureth for ever. Be serviceable to all thy neighbours...

What might rationalist!Rabelais write in place of those passages?

Replacing "God" by "Reality" goes quite a long way.