[RedDevil]

Yes the sun does generate most of the heat and without it life on earth would not be possible. The sun is a given.
What matters for this discussion is whether variations in solar activity cause climate change, and more specific, whether the current changes are caused by it rather than by human activities.

Most people who blame human activity for climate change will point out that the changes in solar activity are too small to cause this effect and that our more than doubling the carbon dioxide content, as well as other human generated greenhouse gases, are the motor behind current changes.

That is not the same as saying variations in solar activity have no effect on climate at all. They very well may have an effect and may have caused changes in the past.
The current changes however cannot be adequately linked to solar activity.
When a lull in sunspots coincides with a regional change in the weather but the effect elsewhere was inverse then it should be clear to all the effects are coincidental instead of causal.