The top chart, from the Gallup Poll, shows the percentage of Americans that are highly religious. The second chart, from the Pew Research Center, shows the percentage of highly religious people in the 34 countries of Europe.
I think it's the general consensus of many in the United States that their country is a very religious one, while Europe is not. That's not strictly true.
As the top chart shows, only about 37% of Americans are highly religious. There are nine countries in Europe that have as many or more highly religious people as in the United States (37% to 55%). The other twenty-five European countries do have a smaller percentage of highly religious people than the United States -- many of them a much smaller percentage. The range is from 7% to 32%.
However, the percentage is shrinking in both the United States and Europe.