Why do we have a Nicene Creed in Mass
It was created at the First Ecumenical Council in Nicaea (325) as a result of Arianism, confusion around who Christ was. It’s included because of the call in 1 Peter 3:15 to always be prepared to give an answer for the hope that is in you.
Why is there a red candle burning all the time?
It signifies Christs presence in the tabernacle. Modern day burning bush. Consecrated Eucharist in the church.
Why is a church roof shaped that way?
Nave (Latin: Navis, meaning ship) where the congregation gather looks like an inverted hull of a ship. Church = ark carrying us through flood of life to heaven.