So, religions are just illusionary divisions created by all too fallible people.
There is only one single human Dharma, just like there is only one human race and one human culture (customs may differ).
People may approach God (their higher Self) in all sorts of ways perhaps not even being aware that they are doing so. But this has nothing to do with any religious context they may imagine themselves to be in.
Every living being so also every human being is caught up in the same cycle of life, death and reincarnation and subject to the exact same system of action and reaction (karma).
No imagined religious dharma or atheist attitude will be able to influence that, we're all in that same system together just like we are all breathing the same oxygen in order to keep ourselves alive.
When Ananda Marga builds a center somewhere, do they take advantage of land that is zoned 'religious' or do they build it on land zoned 'multi-use'?
I have no idea. I didn't even know such distinctions in land use were made.
In practical life, you have to adjust with the limited vision of the authories or you would get little done, given that you stick to following the Yama's and Niyama's of course.
I have to stress that the way I express this rather universal stance is very personal. It is more or less in line with the ideology of Shrii Sarkar, but the way you express things matters in how people react to it.