It's an old idiom. To say something is 'inside baseball' is to say it relies on a rather esoteric or specialized knowledge about the field.
If you asked most people what the worst possible sin could be, you'd get things like murder, rape, etc... Only the people that have done their reading know that this is explicitly labeled such.
You're good, this is sorta theology inside baseball so the default assumption that someone doesn't know that is usually the safest.
what does this phrase mean
It's an old idiom. To say something is 'inside baseball' is to say it relies on a rather esoteric or specialized knowledge about the field.
If you asked most people what the worst possible sin could be, you'd get things like murder, rape, etc... Only the people that have done their reading know that this is explicitly labeled such.
ok cool thanks