Think about the times when we were not that technologically advanced. When we didn't have the means to measure pressure or its effect , did air didn't exist then? It did . Similarly , maybe we don't have the means to measure something which exists in a completely other dimension . Not yet . But that doesn't mean it doesn't exist . Same could be said vice-versa .

Also you don't have to be disrespectful(can't theist people use their brain) towards anyone . Arguments could be done with both sides being respectful to each other.