Can you Sail the Atlantic from Gibraltar to Panama?

You certainly can if you have an ocean going yacht and the seamanship skills to undertake the journey.
You certainly can.
There's absolutely no reason why you couldn't, so long as you have the necessary seamanship and navigation skills. However, it occurs to me that if you already have these skills, you wouldn't have to ask this question.
I can't, but it's perfectly possible for a sailor with the necessary skills.
Yes, assuming that you have the necessary navigational skills - but if you did have the skills, you wouldn't be asking this question.