What does this sentence mean? Someone wrote it online?

From the tone of the speaker, "normal terms" would likely mean through secular means. "Hidden dark agenda" is the speaker's defensiveness revealing itself. That is, "it is pushy to speak about Christat all, it is not normal to find joy and share it without science or meds, and the only reason one would speak of Christ would be to convert me and make me admit that there is something greater than me".