The church of christ is not the building but the Christian. It is important that the people of God (Christians) gather, in the book of hebrews chapter 10v25,the writer clearly states that we( Christians ) should not forsake the assembling of ourselves together. When the church comes together,there is a co-operate anointing and fellowship that they enjoy and this is what the devil is trying to stop the church from doing, because he (the devil) knows that when the church of Christ prays in unity, his works are frustrated. If you think closing down churches has helped reduce the spread of the virus, then you need to do a rethink. How can markets be opened and the churches are not, it makes no sense.
So these are the reason why Pastors are doing all they can to ensure that churches are open again and not because of your tithes or offerings. Many pastors work hard for their money and it would be unwise to jump into a conclusion without making any investigation on how they got their money.
Also,you said they haven't been able to heal Corona virus. Well a lot of people have gotten healed,its just that you are not aware. The church of God is marching on and rye gates of hell shall not prevail against it.
Stay blessed.