You can't jump in and out to get a different buff, as soon as you get a gospel buff it will say on you log menu - YOU GOT THIS for X seconds.
During 10 secs you won't get another buff and the next buff attempt will come from gospel after that exactly 10 secs too.
Waiting for the right buff or not depends on how heavy the competition is. If it's heavy sometimes you've to pray that you get the right one and find the mvp fast, if not you can wait I guess if it's to one shot and you know +/- where the mvp is and it isn't called Mistress or Lady Tanee or Maya or some heavy tele B*itch.
TBH I only used Gospel for Atroce or Satan, others never cared that much about it.
It doesn't give that much of an advantage, formulas in renewal make advantage of lv 4 weapons sure but atk makes it a big portion too. IP sucks in atk so only the effect is cared. Renewal makes stuff much more easy and change a lot the mechanics of the game and that's why people don't like - easy game, easy kills, 2OPstuff, no challenge ):
Also, most of the time if you want dmg you go look for 2 aspects in renewal - lv4 weapons and atk of the weapon and then multipliers and mix both to check which is better[in some of this aspects I agree that this is right, lv4 weapons should be the best] and not as in pre-renewal - slots->atk->multipliers->math power on (...) lv of the weapon? Wth is that lol
Just check the formula of atk at renewal at irowiki and go wow about the equip part and you will understand.
Archer class kinda suck in renewal, their dmg is like crap without a specific set and they're a bit limited on the actions to do since most of the good stuff they used to do now is junk :|
Mage class the same, no more insta spam. Or you get super INT to drop 2+ Tetra Vortex or you stay as a debuffer/annoying status class.
Most of the time renewal is all about Dragon's Breath and Gate of Hell, RK and Shura since DB if isn't fixed gives pwn pwn pwn since only pasana counters it[not sure on this but I think it bypasses thara and other -% race reduces] and Gate of Hell is Gate of Hell.... You Die, You Die, You Die, ups, You Die again, You Die and You Die. It's hard to survive one unless you're a fatty char with lots of reduces.