What do you mean by 'forbidden?'
Forbidden by man and religion, perhaps, but not by Christ. That's what's tricky about living in the Age of Grace. We're free to do anything we want. If we 'convert,' however, we shouldn't be surprised if Christ tells the Father, "I don't know him."
Forbidden in the sense that there would come a consequence.
I've never heard of 'trickiness' in the Age of Grace.
Free to do anything we want? Without consequence? Wow.
Your last statement doesn't appear to follow your point.