This isn't a thread to discuss if discussing something is okay. So let's just drop that line of thought now. I will say though, that some clarification on the OP would be nice. Still, I'll try to answer the questions as best as I can, much like Aeroblast.
From what I understand, for some reason, in the US there actually are no qualifications for running for president. Anyone over the age of 35 who's been living in the US long enough can do it. So I guess if by credible you mean qualified, then sure he's as qualified as you need to be from a technical standpoint. Of course, I think that perhaps some actual political experience might make him more qualified than the bare minimum in a system that has already set the bar pretty low.
There's more to credibility than qualifications though. First and foremost, a foreign nation has been proven to have been trying (and probably succeeding) to influence the election in which Trump won. Then there's the part where even ignoring that, Trump only won because of your ridiculous electoral colleges, he lost the popular vote. So as far as his being elected goes, there's some pretty big hits on his credibility. On top of that, he's also openly admitted to both tax fraud and sexual assault, has numerous claims of sexual assault on him, has publicly admitted to violating privacy and has a statutory rape charge filed against him. I don't think a poor businessman with no political experience with both confirmed and alleged illegal activities who won an election without having an actual majority vote in an election that was probably rigged in his favour by a foreign nation sounds particularly credible. Yet, somehow, he is legally your president now. So I guess it depends on how you define credible doesn't it?
Do I think that he's going to be a good president since he's miraculously gotten in despite all those weird mars on his credibility? Nope. He's not even really trying to hide that he's basically building a cabinet of his friends that will only serve their own agendas, he's going to cripple your economy with flawed trickle-down economics, he's going to royally screw over anyone who isn't already at least marginally wealthy (just look at the ACA repeal he's going to push through), he's happy to completely destroy the environment and he openly antagonises particular races and religions. That's a very quick summary of why he's going to be an awful president but I think that everything has been said in so much detail by now that quick summary is all you need.
Now, if by "bumping" you mean should he be impeached? Shit yes.
If by that you mean assassinated, no. As much as I would love to see all kinds of horrible fates occur to people like Trump, a quick and merciful assassination is not one of them. Even more so because it would just provide the right - especially the alt-right - with ammunition against the left that we do not want them to have. Besides, murder isn't really something I can condone even when it does come to Trump.
Unfortunately though, even if you do somehow get Trump out of office, you're then just going to get Pence in his stead and I don't think that's much better really. Hell, it could potentially be worse.