You don't have to believe in God to have a spiritual perspective -- see, for example, Buddhism.

As it happens, I do believe in God(dess), but what is needed is not religion so much as spirituality -- see https://en.wikipedia.org/wiki/Spirituality

>The natural result of Atheistic Naturalism is, to me, nihilism and its accompanying depression,

This is a view of atheism which seems predicated on a common theist belief that morality and "purpose" can only exist through belief in a divine being. Yet there are plenty of atheists who are neither nihilistic nor depressed - and plenty of theists who are.

One can believe that life has value, and that life can have a purpose in the context of humanism, and one can even have spirituality without embracing a belief in the supernatural or the divine. As Douglas Adams said, isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?

I don't think there's any harm in giving it a try, even if you decide it's not for you.

Same goes for trying out atheism.

Which of course makes no sense because this is not a brand of coffee.

If you're already an atheist there is no need to "try it" because you are already familiar.

I know, I was suggesting to try out atheism for someone who believes in something else.

All this to say that such suggestions do not make sense, a belief or lack of is not something which someone can "try out". I can imagine that following some major life events, for someone who is inclined to such a change, "trying out" is an option.

Having had all kind of dramatic events in my life I never felt the need to invoque a superior being. YMMV.

That's false though. You don't have to start out committed to anything. You can simply pick up a religious book or attend a religious service and see if it speaks to you.

Are you a believer? Do you think it is enough to just say "I do not believe anymore for the next 2 weeks", really meaning it? If so, it means that the faith was not very strong.

Except for some specific cases, one usually grows with a religion or non-religion and this deeply forges one's perspective.

I'm an adult convert. So what I'm telling you is, I didn't have to start out believing; just curious. Obviously atheism is different because there is no particular doctrine or liturgy to involve yourself in, but you could certainly read atheist polemic.