Some religions are secular- Atheists should oppose these too

[Angrboda]

I have to admit, that confuses me a lot. On what basis do you specifically reject gods that does not account for enough criteria to reject everything supernatural?

I think this goes back to the idea of skepticism. While it is not inherently required in order to take the logical default position against god, if you have been indoctrinated it is. Skepticism ... would also lead to the conclusion that anything supernatural was fictional; not just god. However, it is still possible for someone to believe in the supernatural and be an atheist, however unlikely.

No, the skeptical position would be to conclude that it is unproven and unknown. Concluding something is a fiction requires support of that proposition specifically. Skepticism is the withholding of belief in the absence of sufficient justification for belief.