I'm afraid sola fide is just fine with this. :) No one can truly believe unless he has already been baptized by the Holy Spirit. That is, in effect, the installation of faith, and so we believe. Sola Fide is secure. No one can "believe" without the Holy Spirit first acting, otherwise it is just "claiming" to believe. It isn't real.
Thus, Mark seems to suggest that faith is a requirement, but is not salvational without Baptism!
That's right! That IS what he's saying. He's just not talking about water baptism. :) A claimed faith without baptism of the Spirit is a false faith.
So, whatcomes first, FK, faith or the Holy Spirit? Are you more likely to look up and say "There's God!" or does the Holy Spirit "jump" into you and then you say "I believe?"
Do you believe and ask the Holy spirit to come and dwell inside of you or does he just make Hismelf comfortable with or without invitation?
Why do I feel the Protestants believe the latter? No wonder you guys like Paul so much! :)