Big tent means everybody is welcome. Our tent is defined by being Christian, so we are going to talk about Jesus. And Jesus talks a lot about how to love, non-judgement, addressing your own issues in life, forgiving others, living with them gracefully, etc.
If we take him seriously, we aren't EVER going to be telling you what kind of food is wrong, which categories of people are evil, etc. Because that flies in the face of the things that he taught (see above).
Now, in our church experience, that has caused a lot of consternation. People WANT to be told what to do towards God, what to believe, what political party to vote, etc. They want to be told what we believe, so they can decide if they are for or against US not Jesus.
And if we were to do it, the biggest problem with us spelling out what we believe and requiring you to conform to it, is that essentially, it is requiring you to think, pray, live, LIKE US.
And while we are REALLY confident about Jesus and his purposes for you, we are still very much works in progress, and we would like the same opportunity we are affording you - to grow as God leads us.