A Jew cannot be a Freemason.
They conduct a separate universalist - or "anthropo-centric"; "Luciferian" - religion, in which they make use of their own inventions that they graft onto Lashon HaKodesh.
By that action they stray from the Sheva Mitzvot B'nei Noah by inventing their own religious rites, and thus a Jew can certainly not partake. These rituals cannot both use Lashon HaKodesh, be secretly dispersed between parts of the organization, and use lingual inventions which are or aren't derived from the Torah by exegesis.
A "trade organization" with Christians, Muslims, atheists and a few Jews is not a Torah context. To chas v'shalom willingly enter such a context, to support these uses of Lashon HaKodesh indirectly or directly, is a chillul HaShem.
For a concrete example, see the term "Jahbulon":
Then there's the fact that they seem to literally eat babies, and they certainly participate in the international child sex trafficking circuits. That particular crime is said to affect 9.000.000 children or more each year, an insanely high number.
For example, the Royal Order of Jesters, a secret order of Freemasonry (the "we have secrets but aren't secret"-spiel only flies for the lodges which are open to all), has been known to arrange for itself child prostitutes and otherwise employ the services of human traffickers. Their Wikipedia page has currently been scrubbed to only represent their use of prostitutes, not their use of illegal sex-trafficking circuits involving minors.
The Royal Order of Jesters is a secret, invite-only society, as long as they are there will never be a way to clear them of that blemish.
You think they've found a way to make teshuvah to the victims and to HaShem by now? How are you going to know for certain?
Freemasonry allows for secret societies such as the Royal Order of Jesters that have been involved in obviously criminal behaviors under its umbrella, thus it is society which functions as an umbrella for secret societies with histories of obviously criminal behaviors.
Associating with such an organization is, again, a chillul HaShem.
Even associating with their worldly trades is very doubtful.
A Jew must not take their parnassah from the sitra achra.
I'm a ger and I wouldn't sell them a pencil or a piece of vellum. It's not worth it.