Oh...I know you meant no harm, and no harm done. I reply honestly and expect the same in return as I respect you.
If you believed exactly as me it would be boring. You would be right, but it would be boring.
You mention us having the same Spirit. We do, and that matters. Those Christians God told not to condemn other believers also had the same Spirit.
And those Christians who believe your worship to be satanic for using a piano share the same Spirit.
That is the important part. Be fully convinced in your mind. Know we are of the same Spirit. Do not condemn other believers.