I just want to highlight a few points here, insha Alla
Firstly, once anyone has already sought advise from a sheikh/ ulama, and you have been given a clear answer - you should NOT be looking elsewhere for an answer to the same problem.
This is called 'shopping for a fatwa'......when we are not happy with the ruling made by one.....so we hop from one sheikh to the next, hoping to get the answer that we want to hear.
And this intention is incorrect.
We mould our lives to the teachings of Islam.....and NOT the other way around.
Secondly, it is clear that you are unhappy with certain principles in Islam such as this (perhaps others as well......which is why you have chosen to label yourself an 'atheist' here, yet u wish to take shahada again next week, according to your OP).
--> In this regard, please know that religion is not something that can be taken lightly.
We are speaking about your CREATOR here.
We are not muslims today, and then Christians tomorrow, and atheists the next day.....just because we are displeased with our Lord!
Who are we - the CREATION, complaining about the CREATOR?!
Do you not realise that EVERYTHING in your life - EVERYTHING - from your heart that has just given one more beat....to the air you breath......is ALL thanks to Him?
We can not praise Him enough, when we realise this.
And finally, its understandable why you feel upset about this situation.
You wish to reconcile with your wife, but it is impermissible to do so.
The lesson here is that talaaq is not something that is taken lightly in Islam.
There is a hadith that mentions that when talaaq is uttered - the entire Arsh/ throne of Allah (subhanawata ála) shakes......Can you imagine that?
(admittedly, some say this is a weak narration.....but still, do contemplate on the seriousness of the matter).
Islam dearly wants to keep couples together.
Therefore the 3 talaaq rule.
If it is done correctly - there is great wisdom in it.
Just think about it:
A man utters one talaaq to his wife.
Then she is expected to sit for 3 monthly cycles in iddat at the wedded home.
In this time, she should be beautifying herself, etc.....and insha Allah, in those 3 months - tempers subside, love returns.....and they make up.
They fight again.....2nd talaaq.....2nd cycle of 3 months iddat.....and insha Allah, reunion.
And yet again for a 3rd talaaq.
Thats 9 months of iddat in total......time to make amends and keep the marriage together.
BUT: when talaaq is given together - that is all thrown out the window.
No chance for reconciliation.
And we cannot say that we did not KNOW about the 3 talaaq rule.
You must of known, to have chosen to utter it 3 times.
Does anyone say - 'I marry u, I marry u, I marry u'- 3 times?
No....its not natural.
This 3 talaaq at once issue is done with knowledge......and yet we disregard its severity!
Brother - indeed this is a difficult situation.
But, please realise that 2 wrongs do not make a right.
By committing yet another act that is Haraam (ie. your wife re-marrying with the intention of reuniting with you at a later stage) is not the way forward.
What kind of marriage can it be - when it has been based on something so displeasing to your Creator?
Brother - accept the situation.
This is the decree of Allah (subhaana wataála).
This is HIS plan for your lives.....and HIS plan is ALWAYS the BEST plan.
Believe in this implicitly.
If we can only realise: that behind each and every decision made by Allah Ta’ala there is goodness and wisdom.
Outwardly, it may appear as if there is some problem that we are faced with, but only He knows what the future holds.
Do not doubt this.
Turn towards Allah - if you still believe in His Oneness, and that Mohammed (sallahu alaihi wasalam) is the final messenger of Allah, and you are willing to SUBMIT your life to the commands of the one that has given you life, brought you out of nothing.....then take your shahada.
It need not be in a masjid....it can be done right now as you read this.
What matters is not who is around you at the time, but your intention and sincerity when taking shahada.
May Allah guide you onto the straight path, and fill your heart with understanding, patience and acceptance. Ameen