OK - im not one for softening blows and I say it how I see it so im sorry of this offends in anyway but sometimes - you gotta grasp the nettles.
Now what Im wondering is this - are you afraid of offending/hurting your father in some way by listening to the materials you talked about? or specifically - are you afraid of his reaction?
The next thing is whilst not an excuse - I do know that MS can and does alter folks personalities (depending on severity) so this may be a small consideration but the facts remain this.
If YOU cant 'fall in' with his chrisatianity - or if he feel you are 'wrong' for not being a christian - who is at fault?
Why should you 'fall in' just to keep him happy? BUT whilst difficult - why should you bomb him with your beliefs?
I dont have a 'meditation' space as such - I prefer to do this outdoors - but alot of folk meditate before going to bed - now given you sleep on the couch - perhaps that is one place you could adopt for this purpose. As for a 'personal' place or personal temple - isnt the whole world our temple?
I live my parents - they are my primary carers as im 'disabled' - they are both catholic (I still love em tho

) yet I dont push my faith on them (in fact they probably are unaware of it fully) and they havent pushed theirs on me since I was 14 or so.
In some ways - and this may be hard - i think if you have not done so already - you need to have a sit down talk with your dad - keep it calm and polite and talk about your feelings and wishes. Just cos he has MS doesnt not mean he has a right to use it as a tool for his own ends or to guilt trip you etc. You both need to give and take. You also need to realise your own needs are as important as your dads - cos if you become 'ill' - what happens to dad?
He is lucky he has you to care for him - you obviously sacrifice alot for him and he needs to understand that you have needs as much as he does. What would he do if you werent there?
As silly as this may sound - even your front door (outside the apartment) or the main entrance could be your little 'quiet' spot - somewhere to go for 5 mins etc - but I have to say that I dont why your dad MUST understand your faith etc. Some folk find the idea of other faiths somewhat intimidating or even fearful. We all know there are many reactions to fear and your dads 'blanking' you on is one of them - if I cant hear it - it will go away.
Dont push the issue - just do what you do and as said - in time - he'll probably ask questions or whatever - just dont thrust it down his throat. It is early days and there is no hurry - its not like your sacrificing lambs on his lap or anything offensive

Situations are often not as bad as we believe when looked at from another point of view - I feel because its on your mind - it feels worse than it is or should be. Try to relax a bit - maybe even 'cool' off for a week then perhaps (if you can) talk to your dad about it for a few minutes - the instant things feel they are headed towards hostile - walk away - dont turn it into a fight - it takes two to argue and fight.
The Jo Campbell lectures are great and educational for anyone - if he chooses not to listen etc - then its your dads loss.
Out of interest - was your dad raised a christian or did he convert to christianity later on in life?
Hope this helps MTFBWY - A