As Christians we are wealthy to have hit the "holy lottery" of religions. However that is a call to our Grace and Longsuffering to those who did not. After all, there will not be a multiple choice quiz at the gate of Heaven for those who happened to pick the correct earthly religion. Don't be...
No. The one I have (from my days of youthful disgrace) I consider a reminder that I am a recovering sinner. Just in case I get the urge to look down my nose at my brother.
You cannot betray Him through acts. He is greater than anything you have done. That said, the good man is not the one that never falls down, he is the one that gets up. And then gets up again, and again, and again. Keep getting up.
I don't play games that have excessive violence. Other than that I play what is fun. Also, an activity is good that makes you a better person for having experienced it - I use that to guide my "playtimes" as well.
Prayer helps so much when the enemy weighs upon us. The devil is primarily a con and a deceiver, and so our earnest prayers and walk with God help illuminate the advesary's schemes.
I'm 41 and taking care of my father (76). I think that it isn't mentioned enough the types of sacrifice we are called to do when dealing with the older generations. I worry about millennials that aren't ready to sacrifice in this way. Be brave!