Define In Name Only Meaning

In Name Only
nominally, formally; not actual, only by terminology

The President is the head of the country in name only. Congress makes the law.
By Belita
Christian In Name Only
When you push pro-Christian values, but ignore everything Jesus said about helping your sister or brother and loving everyone unconditionally.

Susan: Bill is such a strong Christian.

John: Hardly. Bill is a card carrying member of the KKK. He's more of a Christian in name only sort of guy.
By Mela