I'm always a little leery of folks who refuse to commune or worship with anyone outside their denomination—even other strong Bible-believing Christians.
Are the Episcopalians and the ELCA Lutherans considered by you to be strong Bible-believing Christians? Would you consider fellowshiping and communing with them? If not, where are you drawing a line? Remember, a little leaven, leavens the whole lump. There is nothing sanctimonious about those who are members of the ELS and WELS. Have any of them ever pointed there finger at another Christian and called them bad? No. Just because they have set standards on how they approach the inerrant Word of God and desire that all who fellowship with them be in agreement with them does not make them sanctimonius. This nation requires all who desire citizenship to support the Constitution of the U.S. It is much more important to set standards in a church body than it is in government. Just look at what is happening to church bodies who don't support strict adherence to doctrine. They are fracturing. I would rather have people thinking the WELS and ELS are sanctimonius than allowing those in who would promote schisms like is happening in other church bodies. The promoting of the pure Gospel message is far to important than opening the door to everyone who claims to be a Christian in the name of being inclusive. An example, how many claim to be Christian and yet claim that the Bible doesn't speak against homosexuality? In your thinking, there would nothing wrong with communing with this "Christian", whereas, I see Satan at work to destroy the church.