Yes, welcome Karen.
I agree with much of what you say - I hope that's gentle enough!
IMO I don't think there should be a reference to a higher power in the Big Plan because it would be an unnecessary obstacle to a lot of people.
The only concern I would have about including the words "With God's strength" in a Big Plan is that it makes it dependant on your faith and so it will fall if this is ever lost.
IMO you could still draw strength from your belief that God is with you on this even if He is not explicitly mentioned in the Big Plan, just as you could with anything good such as a fitness regime for example.