well its quite simple. open up ur C:\Program Files\SEGA\Medieval II Total War\data\descr_campaign_db



<religion>
<max_witches_per_region uint="1"/>
<max_witches uint="20"/>
<max_heretics_per_region uint="1"/>
<max_heretics uint="80"/>
<max_heretics_conversion_modifier float="1.0"/>
<max_inquisitors_per_region uint="1"/>
<max_inquisitors uint="10"/>
<heretic_conversion_rate_modifier float="0.0075"/>
<heretic_conversion_rate_offset float="0.025"/>
<witch_conversion_rate_modifier float="0.0098"/>
<witch_conversion_rate_offset float="0.02"/>
<inquisitor_conversion_rate_modifier float="0.010"/>
<inquisitor_conversion_rate_offset float="0.04"/>
<priest_conversion_rate_modifier float="0.004"/>
<priest_conversion_rate_offset float="0.015"/>
<witch_creation_modifier float="1.0"/>
<heretic_creation_modifier float="0.4"/>
<inquisitor_creation_modifier float="0.2"/>
<min_cardinal_piety uint="5"/>
<convert_to_heretic_base_modifier float="10.0"/>
<convert_to_heretic_unorthodox_modifier float="0.7"/>
</religion>

max_heretics_per_region unit="0"
max_heretics unit="0"
inquisitor_creation_modifier float="0."

that should get rid of those pessky lol

if this is wrong let me know please. Hope it helps