I've actually been thinking about this a lot lately. One book I read recently described religions as a language; as a Christian in a specific denomination, I was taught to experience God in a very specific way, using specific language and doctrines--or vocabulary and grammars, to continue the linguistic metaphor. Therefore, since I speak this very specific religious "language," while other dialects might be closer to mine than others, it will be impossible for me to fully understand the religious experience of people who are, say, Jain, for example.

That's not to say that the Jain religious experience is any less worthwhile or "true" than mine. We are both accessing God in ways that our cultures have taught us. However, I think it's difficult to try to meld these religions; while I can recognize the intrinsic value and spiritual experiences in Jain religion or study it from an academic point of view or visit Jain temples, I will never be comfortable in a worship setting. I will never fully learn their language, just like I could probably never become fluent in German, even if I lived in Germany for an extended period of time. There would always be grammatical subtleties that native speakers grasp intuitively that I would struggle with. Nor is that a bad thing, necessarily; I have my own language and way of viewing God. While German is just as good a language as English, I will choose to continue writing and speaking in English.

This is something that I've been thinking about lately. I too grew up in a rather rigid version of Christianity, with very defined black and white areas. As an adult, these boundaries have crashed down on me and I sometimes cast about to see what I really do believe. I can't separate myself from my upbringing, so the thought does occur to me at times that I'm "becoming a heathen." And then I laugh at myself because I don't know what that means anymore either. If I mean setting myself apart from the rigidity of the churches I went to as a child, then I see that as a good thing. I guess what I worry about it it that I'm somehow falling away from God, falling into all these errors that I was always taught about.
 
Those are the doubts. On the other hand, I think there is absolute truth and that this is necessarily connected with God. When I look at the world, at different faiths, at different practices and beliefs, I kind of hold them up to this truth. Christianity falls short a lot. Everybody knows that and that's why so many people are disillusioned with it. But truth is visible everywhere and seeing it through the distortions is important. God's truth is still truth wherever you find it. The truth is more important than the names to put to it.
 
So yes, we can be too inclusive, if we embrace the practices and beliefs of others just for the sake of being open minded. If, for example, a group believed in child sacrifice, in my opinion it would be too inclusive to just accept that.
 
Like so many things in life, I am feeling my way through this issue. I don't know the answers. I feel I know very little, actually. I struggle with how to teach my children when I don't have any answers myself. How do I avoid losing my own spiritual identity? I don't know. What is my spiritual identity these days? I love God. I believe he loves everyone absolutely and he created everything. That's about the extent of my dogmatic beliefs. I try to love others and see the world as God sees it. I take it as it comes, one step at a time.