Yes and no. Yes in the fact that both are non-profit organizations, however churches are classified as a 501(c)(3) for which there are political restrictions upon things they can do (like supporting or donating to candidates, or even comparing candidates.) While unions are under 501(c)(5) which does not include any of the same restrictions.
Apparently, to start up a religious organization, one only need a small number of people to follow the religion, and the number is ten. For organizations the number would be the same.
Civil Unions in Rhode Island provide all the same rights and responsibilities as legal marriage, except that there are extensive religious exemptions which permit any religiously affiliated organization of institution to refuse to recognize same-sex civil unions.
Since individual churches already have the right to refuse to perform weddings because of race, creed, color, national origin, disability, age, etc., there is no logical reason why sexual orientation and gender should enjoy any special protection. Religious organizations are exempt from discrimination laws.
No. Alaska currently does not recognize or perform same-sex civil unions.
No, civil unions are banned and unrecognized in Utah.
No. Same-sex marriages, civil unions and domestic partnerships are not legally recognized in Vanuatu.
No. Although civil unions are not legally defined in Iowa, same-sex marriages are legal in Iowa.
No. Civil unions are not legal in American Samoa.
Yes. Same-sex marriage is legal in Massachusetts and out-of-state civil unions are recognized as legal marriages.
No. Civil unions are not legal under the laws of the state of Tennessee.
No, civil unions and domestic partnerships are not legally defined in Oklahoma.
No, civil unions and domestic partnerships are not legally defined in Pennsylvania.