I agree it's sometimes beneficial to spawn near the cult building, but not when they're all already outside waiting for you to move (which makes sense actually because they had you coming). Charging at them like that would be suicidal with every armed dude shooting at you not once, but three-four times with their full TUs. So what usually happens:
1. You spawn super close to the base. Cultists are inside, whom you can effortlessly whack as they try to exit, for extra sadist points you can also burn/poison all the exits so they set themselves on fire/damage themselves as they move, throw the mines, cooked grenades, etc, full police brutality mode. That's the easiest smackdown and it's really fun.
2. Same as 1, but cultists are all outside swarming your vehicle and staring at you. This is where you die. Sometimes you can make it if you're able to kill the closest dudes without dying and taking cover behind your car/near objects which never seem to spawn closely (but all enemies conveniently have cover), however this always results at least in one injury.
3. You spawn relatively far on the opposite corner of the building. This can be either slow and boring, or exciting and thrilling infiltration with long-range sniping involved. Enemies can surprise you with their sniper-spotter tactic too and grenade launcher you all the way from their base (which you can do too and it's fun seeing them go apeshit when you grenade their highest ranking dude from afar as they start shooting each other).
