"The other ideas are nice however Spain has allready an extra missionary and conversion strength so it have less to gain from then somebody who do not get what Spain get"
I disagree. Having the additional missionary and more missionary buffs make a big difference if you are conquering non-believers. As Spain is one the the traditional colonial powers, these bonuses are huge in moving forward with colonization. They are even more important if Spain attempts to conquer North Africa with the -2 Sunni debuff.
On the other hand, if your goal is European domination, the religion idea group may not benefit you all that much, especially early.