I like the 7D II, but I like my full frame cameras more.
The 7D II has a better AF system than the 70D, would it benefit you? If I were taking pictures of groups at church maybe not. I would probably be using single shot single point AF mode and using only the center point. I would only need 1 point not 65.
Some people use the multiple points rather than focus and recompose. (focus and recompose where you hold the shutter half way, make focus at your subject and then move your view to your liking before you click) You can toggle the AF point to where you like using single point.
If however you are shooting moving objects all the time it would probably help.
The 7D II is weather sealed, but with the lenses you have that probably isn't going to matter. You are probably not shooting in the rain.
The 7D II does not have the flip screen and it doesn't have touch screen.
It is geared toward Action and Sports with its high frame rate and AF system.
Someone said the 70d could do a Auto Focus Adjustment for lenses. This would be important for me but for most consumers it would be beyond what they would normally do.
Sounds more like a depth of field issue than a focus issue. Use a larger aperture on your widest lens setting. (15mm at f/4 10' from subject gives you infinity)
Here is a DOF calculator
http://www.dofmaster.com/dofjs.html
The few hundred dollars for the 70D over the t5i will give you a 4 or 5 year newer sensor.
All three of these have excellent live view shooting (using the screen to focus) and video modes. With the 70D and t5i you get a flip screen that really helps.