Link to the build:
https://ddb.ac/characters/12876089/5HqQwC
Average Damage at 8th level (assumes no 2ndary Booming Blade Damage)
Baseline damage: 17.7
(see video link for calculating
average damage above)
Warhammer with booming blade
and divine strike: 12.38 damage
Spiritual weapon (l2 cast): 3.75 damage
Spirit Guardians (l4 cast): 13.5 damage
Total damage: 29.63 or 67%
above the baseline
At 9th level:
Baseline damage
(no change from 8th): 17.7
Warhammer with booming blade
and divine strike: 12.38 damage
Spiritual weapon (l2 cast): 3.75 damage
Spirit Guardians (l5 cast): 16.88 damage
Total damage: 33.01 or 86%
above the baseline
At 9th level using Animate Objects (assumes a single target)
(no change from 8th): 17.7
Warhammer with booming blade
and divine strike: 12.38 damage
animate objects (l5 cast): 35.75 damage
Total damage: 48.13 or 172%
above the baseline
(If facing resistance to bludgeoning, drops
significantly)