When I perform salah I put my hands on belly, while few of my friends put their hands on chest. In salah subh (dawn prayer), majority of Muslims in Indonesia recite "dua qunoot" while the rest do not recite it. Just two example,
It's okay. These differences are not deviation, but just diversity in Fiqh
which acceptable. But if a Muslim use other language in salah, I must remind him because this is already a deviation. There is difference between deviation and diversity.
Unfortunately, there are few Muslims who are very strict and cannot accept diversity that they regard as deviation. They are people who meant by Hamza Yusuf.
If I allow you to pray and worship differently than me?. You are not a Muslim, but Christian. So you must follow Christian guideline, just like I follow Islamic guideline.
Did I ever remind a Christian in matter of pray and worship?. Yes! I've ever remind my Christian friend who was lazy to go to church.