There was an article in the Seventh Day Adventist ministerial journal by an SDA pastor from Sweden making a very good case for inclusion. This is interesting as historically the SDA is not welcoming. The verse quoted below is the one he used I took it a bit further.
Isa 56:7 Even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted upon mine altar; for mine house shall be called an house of prayer for all people.
12 Jesus entered the temple area and drove out all who were buying and selling there. He overturned the tables of the money changers and the benches of those selling doves. 13 "It is written," he said to them, "'My house will be called a house of prayer,' but you are making it a den of robbers."
[For mine house] This passage is quoted by the Savior (Matt 21:13), to show the impropriety of employing the temple as a place of traffic and exchange. In that passage he simply quotes the declaration that it should be 'a house of prayer.' There are two ideas in the passage as used by Isaiah; first, that the temple should be regarded as a house of prayer; and, secondly, that the privileges of that house should be extended to all people. The main design of the temple was that God might be there invoked, and the inestimable privilege of calling on him was to be extended to all the nations/people of the earth.
SS: A couple of notes, I have used two different translations the KJV in this instance is probably more correct as it uses people and the NIV uses nation. People in this instance is a group of people or a community in today’s English.
3 Let no foreigner who has bound himself to the LORD say,
"The LORD will surely exclude me from his people."
And let not any eunuch complain, "I am only a dry tree."
(SS: In this instance the word used for eunuch denotes a castrated male, some of these were historically transsexual, there is no way in this instance to know.)
4 For this is what the LORD says:
"To the eunuchs who keep my Sabbaths, who choose what pleases me and hold fast to my covenant —
5 to them I will give within my temple and its walls a memorial and a name better than sons and daughters; I will give them an everlasting name that will not be cut off.