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

[Mister Agenda]

Voltaire claimed that religion would be dead hundreds of year ago, but still the vast majority of people profess belief in organized religion.

The USA was about 92% religious (86% Christian) in 1990 and atheists were about 1% of the population. Those who didn't identify with any religion (Nones) were 8% in 1990 and now they're about 20% (about 30% among Millenials). That's a huge change in just 25 years. Voltaire was an optimist, yet Maelstrom's claims (at least in developed countries) are correct, and your source verifies this.