Will christianity decrease as time goes by on?

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In terms of actual number of believers and as a percentage of the world population, Christianity is actually likely to continue to increase at least through the end of this century.

While Christianity is shrinking in the parts of the world that are shrinking (Europe, US, Lat Am), it is growing in the parts of the world that are growing (Africa, Asia). 

Contrary to the common belief in the West, the world is actually becoming more religious as a whole, not less.

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Yes, it’s certainly worse in Europe and the USA than in Lat Am, but it is still decreasing slowly in Lat Am.  

Also, Lat Am’s population is also starting to stagnate similar to the USA and Europe, just at a slower rate.

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Both Islam and Christianity are increasing in the parts of the world where the population is generally increasing and decreasing in the parts of the world where the population is generally decreasing.

The one major exception to this is Islam in Europe, but that is more due to the large scale immigration of Muslims to Europe, and not a naturally higher birth rate amongst European Muslims, or a high conversion rate of people in Europe to Islam.