minimus, it is true that I need to "make sure of" certain things before accepting them as true, but not for all things. The stronger the claim and/or the greater significance to the claim to me, the more evidence I need to convince me to accept/believe the claim. If the claim is a strong one and/or a very significant one then I don't want to believe it upon hearsay (or second-hand) evidence, unless I consider that source of evidence to be reliable (such as a news organization that I trust).
By the way your statement of "make sure of all things" reminds me of the WT book called "Make Sure Of All Things - Hold Fast To What Is Fine" (1965 edition) and the Bible verse (1 Thessalonians 5:21 [1961 NWT edition]) it is based upon. I am impressed by that book (in regards to the approach it uses to convince people) because for the most part it merely quoted Bible verses rather than engages in argumentation/reasoning. It lets the Bible speak for itself, on specific topics.
Regarding whether the WT/JW religion is a cult, whenever I look up the Jehovah's Witnesses religion in a dictionary or an encyclopedia, no matter which dictionary or encyclopedia I use, the dictionary never says they are cult. Instead the dictionary or encyclopedia says they are a sect (or a more benign word or phrase is used instead). Furthermore, I own two college sociology textbooks. One of them mentions the JWs and when I look at what it and other college sociology textbooks say about the JWs they never say they are cult. Instead they say they are a sect, or use a more benign word or phrase - such as "a new religion".
One college sociology textbook which I own is called Experience Sociology: SOC 204 Sociology in Everyday Life, SOC 205 Social Change in Societies (copyright 2013). Pages 330-331 of that book says "Those with power in society--including established churches---sometimes label small religious communities whose beliefs and practices are at odds with the dominant culture as cults, often to discredit them." The italics and bold face in that quote are included in the book. That sentence in the book is the only place I saw the book use the word "cult".
The other college sociology textbook I own is called Essentials of Sociology - Fifth Edition (copyright 2002). On page 334 in a box called "Concept Summary: Distinctions Between Churches and Sects" it classifies sects as having the following characteristics. "Degree of tension with society" - "High"; "Attitude toward other institutions and religion" - "Intolerant; rejecting"; "Type of authority" - Charismatic; "Organization" - Informal; "Membership" - "Alienated", and "Examples" - Jehovah's Witnesses, Amish, Nation of Islam". Notice it lists the Jehovah's Witnesses as an example of a sect and notice that is its lists of the characteristics of a sect excellent fit the Jehovah's Witnesses.
Page 332 of the same textbook under the heading of "Sectlike Religions" has the following paragraph.
"Within the category of religious organizations that have greater tension with society there is great deal of variability. We can distinguish three levels of tension. First are cults, with the greatest tension, then sects, and finally established sects. The latter begin to approach institutionalization."
The subheading of "Sects" has the following two paragraphs.
"Within the general category of sectlike religions, those called sects occupy a medium position. They reject the social world in which they live, but they embrace the religious heritage of the surrounding society. The Amish are an excellent example. They base their lives on a strict reading of the Bible and remain aloof from the contemporary world.
Sects often view themselves as restoring true faith, which has been mislaid by religious institutions too eager to compromise with society. They see themselves as preservers of religious tradition rather than innovators. Like the Reformation churches of Calvin and Luther, they believe they are cleansing the church of its secular associations. However offbeat it may be in comparison to mainline churches, if a religious group in the United States uses the Bible as its source of inspiration and guidance, then it is probably a sect rather than a cult." [The boldface in that quote is by me, the boldface is not in the quoted passage of the book but the sentence is.] By that sociology college textbook [Essentials of Sociology - Fifth Edition (copyright 2002)] the JWs are explicitly called and defined as a sect and not a cult.
The edition of the high school textbook which I used in my high school's required course in government/civics is called "Magruder's American Governemnt - 1978" (copyright 1978). On multiple pages it mentions the Jehovah's Witnesses. On page 133 it says the following. "Many important religious freedom cases have been carried to the Supreme Court over the years by Jehovah's Witnesses, a fundamentalist group which very actively promotes its beliefs. Perhaps the stormiest controversy the sect stirred came from its defiance of compulsory flag salute requirements." Note it says it is a sect.
The JWs are a sect which denies being a sect. They are also a very high control religious group which is now very cult-like, but they are still not a cult according the vast majority of sociologists (scientists of sociology) and according to me.
'I rest my case'.