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The question isn't whether or not they have enough evidence, it's whether or not the thing they are accusing him of doing is worthy of removing a sitting president.
Back in the real world, a certain group of people decided Trump needed to be impeached the first day he was in office. And everyone knew it, because these people were pretty open about it.
They didn't care what the charges were, and they don't care today.
The evil that Trump did and was that they want to impeach him for is being Trump.
You're probably not wrong, although I'm not sure anyone was actually open about it. The general message was 'lets give him a chance' .
Regardless, the "democrats wanted to impeach him on day one!" is just a lame talking point that has nothing to do with the facts of the current impeachment proceedings. It's just one of those things they keep saying over and over and over till eventually people start to think it's relevant.
Every president has members of congress trying to impeach them for whatever they can come up with. The majority of Republicans wanted to impeach Obama at one point. Being investigated and criticized is part of being the leader of a democracy.
Again, back in the real world, if we see signs and agitprop from the first day on impeaching Trump, and then facts come out about secret conspiracies to impeach Trump, including RussiaGate, and that fails and then they try again with TitforTat, ... I have to revise your statement...