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The Holy Spirit dwells within the true (emphasize true) believer:

Romans 8:11 "But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you."

1 Corinthians 3:16 "Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you?"

Now, can anything or anyone force the Holy Spirt OUT of a man, once the Holy Spirit dwells within him ?

Such a thing or person would have to overpower God, i.e., overpower the Holy Spirit, chase it away.

Or, a man would have to perhaps defeat God by himself, and push the Holy Spirit out of himself - is this possible ?

None of that is possible, as nothing can overpower God. Which is supported by Christ's words:

John 10

"28 And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.

29 My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand."

So what of people that "backslide", that profess Christ outwardly, then their life turns to wickedness and sin and they fall away from their outward profession of faith ?

The obvious answer: the Holy Spirit never did dwell in them, they merely professed Christ publicly, but were never truly converted, thus were not a true believer.

The Bible even covers pastors who it turns out are workers of iniquity. Are they saved ? They are pastors after all ! Is not every pastor indeed saved ? Not if they are false preachers:

Matthew 7

"15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity."

Note the use of the word NEVER, in "I never knew you".

Though such men publicly profess Christ and even preach the Word, they were NEVER true believers.