For every saint title, you lose a sanctification on the transfer.

Mortal = -1
Half angel = -2
Angel = -3
etc

I'm not sure about the stars, but putting stars before a tranfer isn't a good idea. You gain more from putting them after.

Some things you might want to know:

You cannot transfer to a higher sanctified hero. The transferee must be equal or lower in both sanctification level AND star level.