DISCLAIMER *I do not consider myself an authority, this is just MY opinion, because someone asked*
Church and religion, these are volatile words to use. Their meaning is often contextual. When *I* use the word religion, *I* mean the following:
Anything replacing relationship with legalism.
The definition of legalism: 1. Excessive adherence to law or formula.
I'll explain what I mean:
Pretend that a book has finally been published that explains to men all the perfect things to do, how to do them, and when to do them, to keep their wives happy. I buy this book and read it. I then proceed to do what it says. Using the formula in the book, I know when to do the laundry, buy flowers, say I'm sorry, when it's supposed to be a back rub, and when it's supposed to be more. I know when it's a fix it conversation, and when it's a shut up and just listen to me conversation. In other words, I now know the formula of when X happens, do Y. I don't understand the person I'm married to any better, I just know a formula.
One day my wife finds the book and reads it. After reading the book she figures out that our entire relationship has been reduced to a formula. How does she feel at that point?
If you ask Google to define church, the response is : 1. a building used for public Christian worship 2. a particular Christian organization, typically one with its own clergy, buildings, and distinctive doctrines: "the Church of England".
By definition can the outdoors be a building? God I hope not. I go to the outdoors to get away from buildings.
So by strict definition does "nature = church?"
Now for that contextual thing, in your question is church tied to a building? Are you saying, "If we take the building consideration out of the word church, does church = nature?" The only part of that definition that is left is worship (ignoring Christian at the moment, assuming it is interchangeable). Are you asking about the noun form of the word worship: The feeling or expression of reverence and adoration for a deity: "ancestor worship," or the verb form, to show reverence and adoration for (a deity); honor with religious rites?
If the noun, what you are asking is, "Can I go out into nature and express reverence and adoration for a deity." Yup, you can do that.
If the verb, what you are asking is, "Does going out in to nature show reverence and adoration for a deity?" That depends on one thing, is that deity a legalist? If it is not a legalist, no, going out into nature (in and of itself) will not show reverence or adoration to that deity. Why do I say that? Because as I explained, executing a series of actions, without relationship (understanding a being (person, deity, etc..)) is legalism.
Now, if the question it meant to ask was, does going out into nature make you (us the reader) feel... (I don't want to put words in your mouth, feel free to explain what you feel), then maybe. I have to know how you feel to answer yes to that.
Now for some things that provide context about my answer: Do I personally participate in nature worship? No.
I'm Christian. I believe in being a follower of Jesus Christ. I don't believe in legalism. I find it directly contradictory to relationship. What I mean is: I don't believe being able to follow ten commandments, or 643 laws, or any other legalist actions bring you any closer to a deity, or make you "more" Christian. I truly believe Ghandi's quote regarding how unChristian like followers of Christ are (and can be).
What do I feel when I'm outdoors? Freedom, the way God intended it, and I thank him for it. I invite anyone else's opinion, including one's that contradict mine.