What philosophical evidence is there against believing in non-physical entities?

[Thumpalumpacus]

It's more fun to wait until they start in on each other.  *goes to make popcorn*

At least the believers on this forum are willing to challenge each other. Maybe it is confirmation bias but it truly seems to me that the atheist members do not challenge each other nearly so much. I have never seen one atheist debate another about causality for example . It is nearly always gang up on the theists.

Nonsense. We atheists have goes at each other all the time, even on the topic of god's non-existence (cf. the atheist vs agnostic vs agnostic atheist discussions).

Perhaps you should doff your blinders there. You're startled that atheists agree that they don't believe in god? So startled you cannot look past that premise to find out why, and to what extent?

Says a lot more about you than it does about atheists that you cannot see that much.