Thanks! Very useful and informative.

Another thread has the buildings' conversion rates, though the poster wrote that some figures may be inaccurate.

Buddhist chain:
Buddhist Temple: +1 zeal
Monastery: +2 zeal, +1 zeal neighboring
Temple Complex: +4 zeal, +3 zeal neighboring
Famous Temple: +6 zeal, +5 zeal neighboring

Christian chain:
Chapel: +2 zeal, +2 zeal neighboring
Mission: +4 zeal, +3 zeal neighboring
Church: +6 zeal, +5 zeal neighboring
Cathedral: +8 zeal, +6 zeal neighboring

Nanban chain:
Nanban Trade Port: +4 zeal
Nanban Quarter: +6 zeal, +3 zeal neighboring

Ikko chain:
Jodo Shinshu Temple: +3 zeal, +1 zeal neighboring
Jodo Shinshu Monastery: +5 zeal, +3 zeal neighboring
Jodo Shinshu Sanctuary: +7 zeal, +5 zeal neighboring
Honganji: +10 zeal, +8 zeal neighboring