I agree with you, but one must be aware to what the other is being united that is if you are talking about masonry the church has already given his judgment that is: masonry go against the catholic church teaching and he/she who belong to it is excommunicated from the church and recent Popes renew this affermation. I hope you understand, God bless you!

To be one, united and at peace with one another
externally and materially are good.

But to be one, united and at peace with one another
INTERNALLY and SPIRITUALLY are BEST and SUPREME.

( Especially when both are in union with the same Catholic Faith and Reason. )

To be a man is Catholic Teaching.

To be a woman is Catholic Teaching.

Other than these are publicly opposing Church Teaching.