I would say it depends on the context and the recipient. If the context is casual or conversational I may end with a "Thanks" and my name, or if it's part of an ongoing discussion I sometimes leave it out altogether for the sake of brevity.

If it's more of an official correspondence, I'll put a full signature and either a "Thanks", "Kind Regards", or whatever seems appropriate. Although I have used "In Christ" on occasion which I picked up back in college. It stuck with me because it was brief, subtle, yet very meaningful. Those tend to be the more important and thought-out emails among colleagues in ministry or others close to me. I think using a Christian sign-off is fine, but if it's over-used like anything else it can dilute the meaning.

By the way, while we're on the topic, I'd like to advocate for using the standard signature delimiter. In case you don't know, it's two dashes followed by a space.

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Denny