Regarding the place of a verb.

Grammatically, both sentences are correct. But the placement of the verb does trigger a subtle change in the meaning of those words. In the first example -- 'We are all for secularism' -- the 'all for' construction emphasizes that everybody's in favor of it. "I'm all for it" is a common colloquial expression meaning that I'm very much in favor of it. The second sentence -- 'We all are for secularism' -- states the simple fact that everyone is in favor without emphasizing how much we're in favor of it.

Oh! thanks a lot Andrew for explaining so lucidly.

You're welcome, Razer.

English has a normal neutral placement for adverbs. normal neutral means the way it is usually said and where no added emphasis/change of meaning is intended. Many adverbs change position to give added emphasis or to change the meaning.

I'd say that here, the change is one of emphasis. I don't see the distinction that Merry draws, but I may be missing something.

Both ways are correct.