It's difficult, but if you love those people you have to cut the balance between honesty and respect.

Well my grandparents they're super religious and they don't know I'm atheist so I just go along with whatever they say so there isn't any drama because if they were to find out they probably would try and convert me

As long as they don't try to convert me, we are fine, otherwise I avoid them.

While I don't suppress the fact that I'm agnostic (although I often have to explain it), I do find myself biting my tongue when faced with people I know telling me what God had meant for me or those who have wronged me. It's rather annoying since these people know I'm agnostic, yet ignore that fact. It's like an implied statement of "I know you're agnostic, but you're wrong, and God has a plan for you anyway."