We can addd chart comprehension to your growing list of inept skills.
Oh dear, oh dear! Look at the first chart again and this time at 2016 not 2015...growth was on an upward trend throughout the first half of the year and the latest figures as polling day approached were above 2% - roughly the average year on year over the ten plus years of what will, come July, be the longest economic recovery in US history - if voters made up their minds based on "reports" that claimed the economy was "tanking" I don't think its me that needs to improve in chart comprehension.
And if you check above the blue line you have drawn and follow the trend in unemployment between 2015 and 2018 (say) you will note that it actually fell more sharply in Obama's last two years than it did in Trump's first two.
I don't for a minute think that any of this has too much to do with who is or was President (Presidents don't run the economy - although I suppose they could ruin it - but I don't think either Obama or Trump has done that - yet - but if deficit spending continues to rise as it has throughout both of their Presidencies, they might ultimately have to share responsibility for doing so) - but you claimed that people voted for Trump to "fix" the economy and unemployment...if that is true, then they were surely misinterpreting the data.
So - as far as I can tell - what you seem to be saying is that the reason why Christians voted for Trump (and will again) is because they don't understand who runs the economy.
I suspect there might be other issues involved.