God is the Most Great, God is the Most Great, la illaha ila Allah, I testify that there is no god but God, laaa illaaahaaa ila ALLAAAAAH, I testify that there is nooooo god but GOOOOO, God is Omnipotent over all things, God is Omniscient of all things (including of Himself and His Great Divine Being), none are worthy of worship except God, none has the right to be praised except God, God is the King and Protector and Lord and Light and Ruler and Controller and Creator of the heavens and the earth and everything in them!!!
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Ask and pray to God for protection against envy and other ugliness in the mosque, that they do not view you in any way which form in a bad unright way.
Basically, ask and pray to God, for a visit in the mosque which becomes a good thing, a good and beneficial (spiritually) visit
God hears all prayers (prayer is utterly sacred) of those who believe in Him, and God listens to the one who praise Him.
Countless, literally countless of my prayers to God has been answered positively, and how many of times have I asked God for help, and God had helped me instantly after.
That's because I am in Absolute communion/relationship/union with God, right now this second, and been so everyday 24/7 for about 4 years now.
Accordingly, I am thankful to God Alone, and He has the full right of being praised by me.
In a mosque, one is to show one's conviction of God's Existence, so should the other, and that conviction (which is a fact, since God Truly do exists) which is shared becomes a spiritual and religious celebration.
And one ought to praise and glorify God, with utmost submission and awe of Him, and so should the other, and that praise and glorification, creates a divine bliss and all sort of other great religious-spiritual feelings between the believing brothers or sisters.
A man who gets envyous or hateful or thinks any form of bad thing about a believing man praising and glorifing or worshipping God in the mosque, because of the high level and intensity he does it at, that envyous man is a kaffir and should leave the mosque, for any man praising and glorifing or worshipping God, be it in the mosque or otherwise, a true believer would think of him ONLY good.
To God is our Certain Return, may God forgive us for our sins and have mercy upon us and show us goodness, may God save us from the hellfire and bring us salvation (forgiveness for our sins, thus the entrance to Heaven), Amiiiiin.