If that is true, all are fundamentalists really. I don’t think that is true. Many people have baseless beliefs and ideas.
No, sir, not everyone is a Fundamentalist. There is a certain way that fundamentalists approach religion and modernity that are substantially different than the way those in the mainstream of the same faith do. They have certain attitudes that can be listed and identified, literally checking off certain features on a checklist. This list of traits is so easy to identify, that we can even use the term Fundamentalism to describe certain members of faiths other than Christianity (Fundamentalism is originally a term used to denote a subgroup in Christianity).
Checklist of Fundamentalist traits (fundamentalists will have all, or many of these traits):
1. Belief in a literal reading of their holy scriptures. This begins with the idea that these Scriptures are word for word given by God, but also tends to favor a literal rather than figurative interpretation, such as in a literal historical Adam and Eve. There is little understanding of the play genre has, and scholarship regarding the origins of the sacred manuscripts is treated with suspicion if not outright rejection.
2. A rejection of modern scholarship as having any impact on understanding their faith or the world around them. This can include rejection of scholarship regarding the founder(s) of their religion, scholarship regarding the historicity or lack thereof of the stories within their texts, and even in many cases a general distrust of science and modern higher learning. For example, Fundamentalists are not inclined to value schooling, and if they do go to college, it tends to be in "safe" institutions run by their religious group, where they will not be challenged by the genuine ideas of modern academia. Most notable is the rejection of Evolution,
3. Fundamentalists draw a very small circle about who exactly constitutes the members of their religion. They limit "true believers" to others who share their minority views and ways. We see this in how ISIS attacks regular Islamic institutions, or the way Evangelicals believe that mainline churches are not housed with "real" Christians.
4. Fundamentalists engage in black and white thinking. You are either good or bad, saved or unsaved, us or them, spiritual or carnal.
5. Fundamentalists have a sense of paranoia, suspicion, and subliminal rage against those on the other side of the us/them divide. They may view these other people as trying to destroy the world, for example, or being an agent of Satan.
6. For some reason that I have never understood, Fundamentalists are focused on the Last Days and the End of the World, which they view as imminent. For them, it is the desire to see the old and corrupted pass away and the new and perfect come into being.
7. Fundamentalists choose for their leaders charismatic sorts that can deliver a rousing sermon, but often lack the formal training most groups demand. Again, it has its roots in a basic distrust of higher level learning. For example, you might hear a fundamentalist comment that the Anglican church down the street can have their highfalutin' pastor with his university degrees -- THEY have a pastor who is "spirit led" and "just preaches the Bible."
Anyhow, that is Fundamentalism as I understand it off the top of my head. You can see how this can be describing the "Born Again" believer at the non-denominational church down the street or the the Chabadnik at your local shul or the Wahhabist preaching a return to the teachings of the Quran. Even Buddhists and Hindus can have their fundamentalist types.