Those might actually be better choices than you think. I actually had games for India and Celts where i was choosing those beliefs. .
Scripture for Celts increases pressure of foreing cities agains foreing cities. Thats a debatable choice for sure, but might work under right circumstances.
The main power of Piligrim is not
/
from missionaries. It is almost mothing. Main power is the reformation wonder, which grants +5
to Holy Sites and has 4 slots for Great Works. The only problem is to Reform naturally for India, i doubt AI iis capable of this.....
However i agree that both of this choices require very careful execution AND right situation