He is an ultra-radical amateur religious preacher. By profession, he is a zoologist. He has no theological education.
As a former Catholic who grew up in a strongly religious environment, I say that the less the person in question is theologically educated, the more religiously fanatical their views are. The higher the education of Catholic priests, doctoral degrees and the like, the less fanatical they tend to be.
Amateur preacher Walter Veith has not studied theology, and therefore his theological views are very radical.
Paradoxically, this fanatic has more supporters in the Czech Republic than in Slovakia. Since the Czech Republic is a non-religious country and people in the Czech Republic lack basic theological knowledge, they are more easily manipulated because they cannot judge whether this religious radical is misleading or not.
Walter Veith has endeared himself to many people by sharply criticizing the Catholic Church. However, this is a very misleading thing. Not everyone who criticizes the Catholic Church is automatically right about everything.
Among the most well-known lies and deceptions of Walter Veith is the issue of the origin and manipulation of the Bible. More at this link https://filozofia.nett.to/krestanstvo/sk/manipulacia-biblie-o-bozstve-krista-a-bozskej-trojici
Walter Veith on Wikipedia https://en.wikipedia.org/wiki/Walter_Veith