Yes, obviously Brazil actively wants some of the most massive and out of control forest fires in history blanketing their cities in dark soot and smoke,
What's funny is that not even the 'massive forest fires' story is true.
WARNING: Long-winded rant incoming, some data might be slightly wrong as I'm going from memory here.
July and August are the driest months of the year in the Amazon and Near-Amazon regions. It's also the season of the year for pasture clearing - note that here, I'm not talking about forest-burning to creature pasture(which is illegal); this tends to happen around November. What I'm talking here is maintenance of previously-existing pasture.
However, NASA satellite monitoring of forest fires shows:
1) Fires aren't happening in the Amazon, but in the savannah-forest transition belt around it, as well as Bolivia(where forest fires have exceeded the one million hectares mark, in large part due to an Evo Morales decree to allow large scale planting area-clearing by fire);
2) Up to August, forest fires are more numerous(and affected more area) than the January-August 2018 ones,
but they are still below the historical average.
So, why have been people asking to pray for the Amazon? Brazilian internal politics.
It is well-known that the current President is... disliked by left-leaning people(which tend to make up for a large part of public servants in Brazil, as well as other sectors). In late-July, someone in INPE(the Brazilian organ responsible for satellite monitoring, among other things) leaked a partial report which implied a large leap(I forget the percentage, but it was easily a 20% increase in relation to the previous reference point) in rainforest destroyed by fire. Two problems with the leaked report:
1) The 'previous reference point' I mentioned wasn't the 2018 January-June period, but the
2015 one;
2) What the monitoring detects can be due to forest burning, can be due to other things. Data collected on this monitoring system has to be cross-reference with satellite photos in order to give you the final result. The report was leaked before that cross-referencing, and the way it was divulged implied that the raw data(which gives you a lot of false positives) was the final result.
This resulted in a minor scandal where the President criticized the report(implying foul play), the head of the INPE attacked the President and got fired for it, the opposition cried the Science Ministry was being purged and there were researchers 'afraid' for what would come and all that circus, which simmered down to give place to the newest 'scandal'.
However, one week ago, a cold front reached the city of São Paulo, and the clouds were so dark that even though it was mid-afternoon, night fell over the city. And those who had cried about the 'scientist purge' started screaming histerically that this was the fault of the 'Amazon forest fires', nevermind the fact that this only happened in a city which is more than 2,000 kilometres away from where the fires are supposed to happen(and that nowhere in between suffered from the same thing), nevermind that the fires in Bolivia were both closer and of much higher intensity. People started posting in Twitter satellite photos of cold front clouds saying it was the smoke of the fires.
And thus was the hashtag about praying for the Amazon born. It got really ridiculous when people started posting photos of other forest fires, like the dead rabbit(which happened in India), photos of the Portugal forest fires, and so on.
No photo posted up to August 23rd on twitter, reddit and so on showed the fires that are happening now in Brazil; those are either from fires around the world of from previous Amazon fires(there's a 1989 photo going around; Macron's tweet about our house being on fire had a photo taken in, IIRC, 1999; the photographer that took this one died in 2004).
OK, so what does Macron have anything to do with this?
Well, that is due to French internal and external politics. The EU-Mercosur trade agreement is deeply unpopular with French farmers
(as well as Irish ones; those were the EU countries that heavily criticized Brazil over the fires and both threatened to block the deal - BTW, the deal will first be ratified in the European Parliament before being submitted for each country's approval - it will be years before the matter reach their hands). So what Macron is trying to do is bolster up his popularity. Thing is, Merkel doesn't want to lose the increased exports the deal will give her, so she promptly cuts Macron down at the knees. Trump is friendly towards Bolsonaro, and doesn't want the precedent of environmental concerns blocking down trade agreements. That is even more so for China, which has stated this is 'a manufactured crisis'.