I do agree that your methods wasn't very wise (false dichotomy) - But the conclusion is not wrong. The main argument used by atheists to justify not believing in god is the complete lack of evidence for deities - This applies to the deist or pantheist god as well, so that's it.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you